Slashdot Mirror


Fermi Paradox Predicting Humankind's Future?

An anonymous reader writes "The Fermi paradox says that if extraterrestrial civilizations exist, at least one of them should have colonized the entire galaxy by now. But since there is no evidence of this, humankind must be the only intelligent life in the galaxy. The Space Review has an article on how the Fermi paradox can be applied to human civilization. It says that, like the extraterrestrials, humans have three choices: colonize the galaxy, remain on Earth, or become extinct."

115 of 854 comments (clear)

  1. More likely by Maxo-Texas · · Score: 4, Interesting

    The speed of light is a real and unbreakable rule as a result nothing more than 4 or 5 light years away is reachable.

    Sure- you *might* be able to theoretically build a ship that could go further but all politics is local. Look at our politics- could we gather the will to build a 10 trillion dollar multi-generation star ship?

    I think civ's do okay, never get off the planet the started on, and eventually die out from lack of resources, some kind of self destruction, or being wiped out by an external event.

    --
    She was like chocolate when she drank... semi-sweet at first and then increasingly bitter.
    1. Re:More likely by peragrin · · Score: 4, Interesting

      While the speed of light may be constant it doesn't mean there aren't other ways around the problem.

      Let's figure out how first.

      Besides why would an alien race need the whole galaxy? A small section would do. Even so they could have died out millions of years ago. Or we could be the first advanced race and as we reach out amoung the stars we shall find other less advanced races.

      --
      i thought once I was found, but it was only a dream.
    2. Re:More likely by TomHandy · · Score: 2, Interesting
      Yeah, I think this is where I'm starting to come down on this question. I didn't realize there was a "Fermi paradox" that described this, but I used to also make a similar assumption in regards to UFOs.... that surely there would be a few intelligent species out there that would visit us).

      But it seems like it is a very real possibility that the kind of spacetravel required to visit other species might just be impossible. I don't think one could take it as proof that other intelligent life doesn't exist just because they haven't managed to conquer the galaxy.

    3. Re:More likely by Anonymous Coward · · Score: 5, Funny

      we could be the first advanced race and as we reach out amoung the stars we shall find other less advanced races. ... Lord help them
    4. Re:More likely by AJWM · · Score: 4, Interesting

      The speed of light is a real and unbreakable rule as a result nothing more than 4 or 5 light years away is reachable.

      The Fermi Paradox assumes the light-speed limit.

      There are an awful lot of hidden assumptions in your bald statement that the speed of light automatically limits travel to a range of 4 or 5 ly. Why not 3, or 6, or 10? It doesn't take much to allow for hops from one star to the next, and if you've got the tech to build starships, you've got the tech to colonize a star system that doesn't have Earthlike planets. (Ie space colonies, not terraforming - although the latter may also be possible.)

      I think civ's do okay, never get off the planet the started on, and eventually die out from lack of resources,

      Quite likely a civilization that never gets off its home planet will eventually run out of resources. But there are resources aplenty for those that take that first step. That's why people talk about He3 mining, solar powersats, mining asteroids, etc. Remember O'Neill's question: "Is the surface of a planet the right place for an expanding industrial civilization?" The answer is "no".

      --
      -- Alastair
    5. Re:More likely by SatanicPuppy · · Score: 4, Insightful

      Well, it's a population pressure thing. If there is no limit to your expansion, you'll expand to your limit.

      Not that I don't think Fermi is full of it. All the "There can be no intelligent life if they haven't already a) been found by us or b) taken over the galaxy, theories are pretty foolish. There could be intelligent life inside 10 light years from us, and we wouldn't know it now; hell, we could be living on a planet seeded with life by an advanced society and we wouldn't know it...Maybe the dinosaurs were killed off by an automated terraformer. =P

      Basic probability also suggests that it is extremely unlikely that we are an isolated occurrence...You'd have to buy into Creationism to think that such as we could never have happened anywhere else.

      --
      ad logicam Claiming a proposition is false because it was presented as the conclusion of a fallacious argument.
    6. Re:More likely by Maxo-Texas · · Score: 2, Insightful

      Oh for the love of god this is slashdot- nitpicking on casually slung out ideas is really stupid and pointless.

      If you want to discuss and explore my assertion then hit the meat of my point-

      Regardless of how advanced ANY civilization gets, it will be limited by POLITICS and the SPEED of LIGHT from ever colonizing outside it's native star system.

      I picked 4 or 5 LY because we have exactly one star system in that range and last I heard, it is probably not habitable.

      I was attacking two underlying assumption:
      That all cultures will be prevented by politics from doing really big projects.
      That it is absolutely impossible to break the speed of light (despite a lot of wishful thinking).

      --
      She was like chocolate when she drank... semi-sweet at first and then increasingly bitter.
    7. Re:More likely by squiggleslash · · Score: 4, Funny

      The Fermi Paradox assumes the light-speed limit.

      If it does, I can't see how it'd ever be right, given the fact the universe is still expanding. No civilization can ever populate the entire universe with slower than light travel.

      There are an awful lot of hidden assumptions in your bald statement that the speed of light automatically limits travel to a range of 4 or 5 ly.

      Could be that more than 4-5 light years makes travel a little... hairy. I mean, people start to ...wig-out at those kinds of distances. There's a lot of distance to cover, with a lot of dangerous particles flying in the same space, so it's safe to say the further you go the more... close shaves you'll have!

      Har har har I kill myself.

      --
      You are not alone. This is not normal. None of this is normal.
    8. Re:More likely by SatanicPuppy · · Score: 4, Interesting

      The problem is, expansion is driven by population pressure. The kind of space travel you're theorizing wouldn't do a damn thing to relieve local population pressure, so it would be more of a sort of species level masturbation, to send out ships to make colonies that are so far away that you'd never be able to engage in any sort of trade or cultural exchange.

      --
      ad logicam Claiming a proposition is false because it was presented as the conclusion of a fallacious argument.
    9. Re:More likely by Cerberus7 · · Score: 4, Insightful

      Extremely unlikely also means it's possible. We might very well be the first intelligent life to emerge in this galaxy. We might be the first in the universe. Extremely unlikely doesn't mean impossible. If we are, God help the younger species; the humans are coming.

      --
      I don't know about you, but my servers run on the power of cotton candy and happy thoughts. -Anonymous Coward
    10. Re:More likely by Pxtl · · Score: 2, Insightful

      They've had 10 billion years to visit us. The magnitude of that amount of time is staggering. Consider how far we've come in the last few hundred years. Consider how far along we'll be in a thousand years. Now consider that the universe is a million times older than that.

      Even if it takes a thousand years to build a ship to colonize our nearest star, hypothetical aliens may have had enough time to do that enough times to colonize the whole galaxy.

      That's the Fermi paradox. If space travel is possible, then the time and scale of the universe is so huge that it would have been done millions of times by now. Hence, space travel is impossible or no aliens exist but us.

      Example: say Fnord. If you were the only person in the universe, then you would be the first person to ever say Fnord. However, there are billions of people on earth, and billions more have come and gone. So Fnord has been said many, many, many times. If "Fnord" could spread like a disease, then by now everyone would say "Fnord"... I think I just screwed up my analogy.

    11. Re:More likely by aditi · · Score: 5, Informative

      "The speed of light is a real and unbreakable rule as a result nothing more than 4 or 5 light years away is reachable."

      An insertion here about relativity: if the ship were traveling fast enough, you mightn't need several generations just for 4-5 years. Because of relativistic time dilation, the astronauts in the spaceship would feel considerably less time elapse, while the journey would seem to take decades to everyone on earth. The question then becomes whether people would be willing to spend trillions of dollars on something only their children and grandchildren would see.

    12. Re:More likely by SirWhoopass · · Score: 5, Funny

      It is very easy for humans to ramp up to 10 offspring for 2 parents.
      You must not have children of your own.

    13. Re:More likely by ArcherB · · Score: 2, Insightful

      Basic probability also suggests that it is extremely unlikely that we are an isolated occurrence...You'd have to buy into Creationism to think that such as we could never have happened anywhere else.

      That's like saying "You have to attend Star Trek conventions and speak Klingon to believe in intelligent life outside our solar system". Just as there are whacked out "Creationists" who believe the Earth was created in 6 24-hr periods, there are whacked out groups that believe in extraterrestrial life. Need I bring up Xenu or that cult wearing Nike's that castrated themselves and committed suicide thinking a comet was the "mother ship"?. There are whack jobs in any belief system.

      Why do you consider Creationism and common sense to be mutually exclusive? I believe in God, which means I have to accept that "God created the heavens and the earth" (in that order :-). However, I'm not so naive as to limit an infinite God to a single planet, with a single intelligent species. There is nothing in the Bible that states that man is alone in the universe.

      --
      There is no "I disagree" mod for a reason. Flamebait, Troll, and Overrated are not substitutes.
    14. Re:More likely by broller · · Score: 5, Insightful

      They've had 10 billion years to visit us.

      Sure, if you are only looking for life. If you are looking for intelligent life, the chances are much smaller.

      If they were here in the first 99% of those 10 billion years, they would have missed us. We may be marked as a "potential revisit" but the likelihood of any existing lifeforms knowing that we are here is very small. The likelihood of us knowing that THEY are around is even smaller.

      If the number of potentially viable planets is of any meaningful size, we could be one of a billion planets out there that they plan to eventually come back to.

    15. Re:More likely by Maxo-Texas · · Score: 5, Informative

      You are correct... some interesting comments here http://math.ucr.edu/home/baez/physics/Relativity/S R/rocket.html From the article, for 1g acceleration: Distance Location On Ship Time.
      4.3 ly nearest star 3.6 years
      27 ly Vega 6.6 years
      30,000 ly Center of our galaxy 20 years
      2,000,000 ly Andromeda galaxy 28 years

      --
      She was like chocolate when she drank... semi-sweet at first and then increasingly bitter.
    16. Re:More likely by squiggleslash · · Score: 5, Insightful

      They've actually had about 50,000 years to visit us, less if you only want to count "recorded history". Indeed, any visits done 50,000 years ago would have been to a group of "intelligent" primates who, in all probability, would have had great difficulty in having the contextual skills needed to show intelligence to the visitors.

      So, Fermi's paradox is that something impossible is expected of aliens civilizations, that we have no way to tell has happened. And this is taken seriously, why?

      --
      You are not alone. This is not normal. None of this is normal.
    17. Re:More likely by Smallpond · · Score: 5, Funny

      If you live in a typical suburban neighborhood, there are at least 200 houses within a 30-minute walk. How many have you visited? How many would you visit if it took the entire output of your civilization for 10 years in order to visit?

      Anyway, amongst the nearest alien species this is called the "Brakloo'tj Paradox".

    18. Re:More likely by flyingsquid · · Score: 2, Interesting
      Sure- you *might* be able to theoretically build a ship that could go further but all politics is local. Look at our politics- could we gather the will to build a 10 trillion dollar multi-generation star ship?


      Larry Niven did a lot of hard sci-fi; that is he actually took into account things like elementary physics and economics. The book that sticks out in my mind here is "The Mote in God's Eye", where an alien civilization builds a slower-than-light probe with a light sail and launch it to a nearby star system using a massive laser. The detail I remember is that the extraordinary amount of energy required to do this means that it takes almost the entire energetic output of the alien planet in order to build the probe and then power the laser. Combined with the alien's unstable political system, this means that launching the probe results in a complete collapse of their civilization. Getting a spacecraft to even a small fraction of the speed of light requires vast amounts of energy- more than our current entire energy output, if I recall.

      That's what we're talking about. The energy and resources expended would be non-trivial. It's not like cutting funds to the National Endowments for the Arts current crop of penis-related imagery is going to do it. We're talking trillions of dollars worth of materials, scientific research, power, and soforth, something that would make the Iraq war look cheap in comparison. That's going to mean less money available for things that directly affect the quality of our lives- roads, research into curing AIDS and cancer, helping to develop Africa, law enforcement, national defense, and soforth. Someone has to pay for the energy, materials, manpower, and research that go into building a starship.


      The question is, how much are we willing to pay? A few hundred extra in taxes per year? I could probably stand that. A few thousand? I don't know. Half your wages? I like the idea of space travel, but I don't like it that much. But that's what it might take to do it using anything like current technology. And that's the big question, in my mind- it's not enough to make space travel possible, it has to be economically feasible.

    19. Re:More likely by SatanicPuppy · · Score: 4, Insightful

      Sure, but they could also have colonized the whole galaxy, then devolved and died off in the same period. Or they could just have skipped us because they like metal-rich planets in the liquid water zone with an atmosphere that's primarily methane, or any number of possible scenarios.

      The point is, unless they set up an "Alien Burger" on the moon with a sign forty miles on a side, we'd never know they were around. Omni-directional radio of terrestrial origin has very little chance of ever being received in another solar system.

      There is also the whole "What are the odds of intelligent live evolving at all?" question. It may be that, despite the age of the universe, the conditions for intelligent life took a long time to come together. Or that the process of evolution tends to take a while to produce a space faring civilization.

      There are way too many variables to just automatically say, "If it were going to happen, it would already have happened."

      --
      ad logicam Claiming a proposition is false because it was presented as the conclusion of a fallacious argument.
    20. Re:More likely by Paulrothrock · · Score: 2, Interesting

      The idea that you can "run out" of resources is ridiculous. Silicon, the most plentiful element in the crust of our planet, can be used to harness solar power and convert it into electricity. This electricity can be used to harvest other raw materials or recycle those that have already been utilized. It can also be used to crack water and create rocket fuel. This rocket can then be used to harvest other materials from the inner solar system.

      Through effective recycling and fusion power the solar system can support 100 trillion people. Sure, we might not be able to fund a generation ship, but a mission to mars or pulling an asteroid into earth orbit to harvest minerals is within the realm of a medium-sized government or large corporation.

      --
      I'm in the hole of the broadband donut.
    21. Re:More likely by Canthros · · Score: 2, Funny

      bald[...]
      3. lacking detail; bare; plain; unadorned: a bald prose style.
      [....]

      Welcome to the Internet. Here is your dictionary.

      (In case the misunderstanding was intentional, I do apologize for the unnecessary pedantry.)
      --
      Canthros
    22. Re:More likely by ArcherB · · Score: 4, Insightful

      Hit a nerve, I see.

      Yes. I take it personally when my belief system is used as a synonym for stupid, ignorant or "intellectually backwards". Just as, say a Muslim would takes it personally when Islam is equated to terrorism, or sci-fi fan is equated with "Trekker" (or Trekki, if forget which). I can usually take someone hitting a nerve in stride, but that nerve has been rubbed raw.

      The reason I say you'd have to buy into Creationism, is because in Creationism, God created man, and no other species. That would be the only explanation for how an intelligent species could exist without there being the possibility for other intelligent species.

      Well, there is nothing that says we are not the first intelligent species in the universe. I agree that it is HIGHLY unlikely, but someone has to be the first. Also don't assume that everyone who believes that God created man believes that God stopped there.

      It's not that Creationists lack common sense. It's that they are so rabid about anything that might possibly in some world conceivably be a challenge to their beliefs, that they refuse to accept anything outside their little book. If they were open-minded at all, they wouldn't be pure Creationists. Just that simple.

      There are "jihadis" that are even more rabid in their beliefs, but to say that all Muslims are equally closed minded is just as offensive as your argument. Don't get me wrong, I don't think you mean any disrespect, but stereotyping religions is no different using stereotypes as a basis for racism.

      --
      There is no "I disagree" mod for a reason. Flamebait, Troll, and Overrated are not substitutes.
    23. Re:More likely by sg_oneill · · Score: 2, Insightful

      Yeah. But dude. The aliens would drown in the firmament. Its full of water.

      --
      Excuse the Unicode crap in my posts. That's an apostrophe, and slashdot is busted.
    24. Re:More likely by kinabrew · · Score: 5, Funny

      Oh he will. We'll make sure of it.

    25. Re:More likely by SirWhoopass · · Score: 4, Insightful

      I don't know if government is anti-procreation as much as people expectations of what a minimum lifestyle is. I suppose that counts as society.

      I have a two-bedroom, one-bathroom post-war rambler, about 900 square foot foundation. The family that built this house raised six children in it in the 1950s and 1960s. Today, I am constantly asked when I will buy a bigger house because I have one child.

      Could a "typical" family have six to ten children today? Certainly. Would they all have DVD players, attend summer soccer camp, college funds, and the latest fashions? No.

    26. Re:More likely by __aajfby9338 · · Score: 3, Insightful

      They've had 10 billion years to visit us.

      We've also had 10 billion years to visit them. Since we haven't done so yet, does that imply that we don't exist?

      Even if there are a million advanced civilizations in this galaxy, that doesn't mean that we'd know about them. We've been listening for radio transmissions for a small number of decades; the fact that we haven't detected any alien transmissions just means that no transmissions which are strong enough for us to detect and are modulated in a way that we would notice have arrived at Earth during that very narrow window. Our entire recorded history is also very short compared to 10 billion years, and we'd be unlikely to know about any alien visits which could have occurred before we developed enough to pass on historical information to our children.

      I just don't buy the premise that other civilizations are unlikely to exist simply because we haven't detected them yet. 10 billion years is a long time, but the universe (and even just this galaxy) is a big place, we haven't been around for very long, we've been actively looking for signs of other intelligent life for an extremely short amount of time, and it seems to me that even our ideas about what we should look for are tainted by the assumption that an advanced extraterrestrial civilization would be something like us and see the universe in a similar way.

    27. Re:More likely by uvajed_ekil · · Score: 2, Interesting
      Even if it takes a thousand years to build a ship to colonize our nearest star, hypothetical aliens may have had enough time to do that enough times to colonize the whole galaxy.

      That's the Fermi paradox. If space travel is possible, then the time and scale of the universe is so huge that it would have been done millions of times by now. Hence, space travel is impossible or no aliens exist but us.

      Another possibility: aliens have visited us but have not revealed themselves to us. If their technology is so far superior to ours that it allows for space travel over great distances, it is also possible that they have managed to evade our attempts at detecting them. I won't speculate as to why they would or would not want us to know about them, but I doubt stealth technology is beyond the abilities of anyone capable of traveling in space for years at relativistic speeds.

      I'm also not sure that the time frame for the paradox might not be misleading. We are talking about so many, many years that maybe some race did colonize the galaxy but has died out in our neighborhood, or perhaps we are their descendants. We haven't been observing the galaxy for very long or in any great detail from Earth.

      --
      This is a hacked account, for which the owner can not be held responsible.
    28. Re:More likely by quadelirus · · Score: 4, Interesting

      I don't think Fermi is talking about mere visits, but colonization. If so, we wouldn't have to worry about them missing us, because if they had come, they would have stayed. To quote the wikipedia article: "The second cornerstone of the Fermi paradox is a rejoinder to the argument by scale: given intelligent life's ability to overcome scarcity, and its tendency to colonize new habitats, it seems likely that any advanced civilization would seek out new resources and colonize first their star system, and then surrounding star systems. As there is no evidence on Earth or anywhere else of attempted alien colonization after 13 billion years of the universe's history, either intelligent life is rare or assumptions about the general behavior of intelligent species are flawed."

    29. Re:More likely by Garse+Janacek · · Score: 2, Insightful

      Basic probability also suggests that it is extremely unlikely that we are an isolated occurrence...You'd have to buy into Creationism to think that such as we could never have happened anywhere else.

      Not necessarily. It might be that such as we could have happened somewhere else, but that in fact the probabilities required for intelligent life are so mind-bogglingly bad that it is only by an extremely small chance that it ever emerged anywhere for the entire life of the universe. It could be, for example, that for any given big bang there is only a 1/1,000,000 chance that intelligent life appears. It might then be that, even if we know that it exists (in the form of us), the chance of it having independently appeared elsewhere in the universe, ever, could still be on the order of 1/1,000,000.

      Actually applying probability theory, we're in a very special situation: ordinarily, if you don't know the probability that something happens, and then you observe it to happen, this (roughly speaking) raises the "probable probability" of the event -- that is, if you didn't know if it was likely, and then it happens, you are now reasonable to suspect that it is at least somewhat likely.

      The appearance of intelligent life is different: since this is a probabilistic "experiment" in which it is impossible to observe a negative result (i.e. the non-appearance of intelligent life anywhere in the universe), observing a positive result gives us no information, and we are right where we started, knowing nothing about the general probability of intelligent life except what we can infer from things that are very, very nearby (at least unless and until we can observe the rest of the galaxy/universe in more depth). It's like claiming a coin is likely to land heads-up because that's all you ever observe, when really you're just closing your eyes when it lands tails.

      Now, on the other hand: if we were, ever, to encounter other intelligent life... then your statement holds, and probability theory kicks in to give us real information about the situation. As James P. Hogan wrote, "Two is an impossible number and cannot exist." Knowing intelligent life appeared once (that is, us) tells us nothing (except that the probability, whatever it is, is non-zero): but knowing it appeared twice tells us that it probably appeared uncountably many times. The probability works out differently because, in this case, it is possible to observe a negative result -- it is possible (though how probable, no one knows) that in all the history of humanity we will never encounter other intelligent life. Therefore, actually observing other intelligent life gives us quite a bit of information about how probable such life is...

      I'm still not convinced by the Fermi "Paradox," however, since it seems to be extremely presumptuous about (1) how other intelligent life would behave, if it did exist, and (2) the fundamental engineering constraints imposed by the laws of physics. We know very little about either of these (though (2) isn't looking good in the short term... we'll see in a few thousand years, perhaps).

      --

      I am the man with no sig!

    30. Re:More likely by Phishcast · · Score: 2, Insightful
      Indeed, any visits done 50,000 years ago would have been to a group of "intelligent" primates who, in all probability, would have had great difficulty in having the contextual skills needed to show intelligence to the visitors.

      Who is to say that we have the contextual skills needed to show intelligence to other visitors? Perhaps we're passed by as not intelligent enough to bother with yet.

      Or maybe they're just watching us until we develop and successfully test warp drive.

    31. Re:More likely by Vampo · · Score: 5, Funny

      We may be marked as a "potential revisit"

      I believe the correct term is "Mostly Harmless"

    32. Re:More likely by amRadioHed · · Score: 3, Interesting

      Don't get me wrong, I don't think you mean any disrespect, but stereotyping religions is no different using stereotypes as a basis for racism. To be honest stereotyping based on religion is actually far different from stereotyping based on race. Race tells you nothing about a person but how they look, it is set in stone before they are born and they have no choice in it. Religion OTOH is something that everyone chooses for themselves and it changes with the person throughout their life. As such, religious belief does say quite a lot about a person.

      That said, no one here knows enough about your religious belief to make a judgment about you. But if we did know you better we certainly could make a fair judgment based on it.
      --
      We hope your rules and wisdom choke you / Now we are one in everlasting peace
    33. Re:More likely by spun · · Score: 3, Insightful

      Religion is different from race. Religion is consciously chose, race isn't. Religions, as a rule, mix common sense rules with some amount of logic-defying ridiculousness. The common sense rules hook people in, and then the illogic breaks their minds, rendering them incapable of making rational decisions on their own. They become cattle for the priestly class which profit from their mental enslavement. Religion teaches people that they are incapable of thinking for themselves, that they need a higher power, always speaking to them through a human intermediary, in order to know how to live correctly. Religion is a form of mass psychosis. It is no more a legitimate "belief system" than the ramblings of a paranoid schizophrenic.

      Almost by definition, a person has to mentally damaged in order to accept religion. This is no slight against any person so damaged, any more than a person damaged by a viral infection is at fault. It is not your fault that your mind was infected by an insidious mental virus that has damaged your ability to think, in order to make you better at spreading the virus to others. But you should not be respected for having the virus, and your attempts to pass the virus on to others should be stopped.

      --
      - None can love freedom heartily, but good men; the rest love not freedom, but license. -- John Milton
    34. Re:More likely by indytx · · Score: 2, Funny
      The point is, unless they set up an "Alien Burger" on the moon with a sign forty miles on a side, we'd never know they were around.

      I think it's more likely that they would set up a restaurant that serves Swedish meatballs. Everyone has a version of Swedish meatballs.

      --
      Make love, not reality television.
    35. Re:More likely by quadelirus · · Score: 3, Insightful

      "We've also had 10 billion years to visit them. Since we haven't done so yet, does that imply that we don't exist?"

      The argument requires the mediocrity principle which implies that if there are many other intelligent civilizations many of them would be far more advanced then we are. Given that it doesn't matter that we've had 10 billion years to visit them-we are the less advanced civilization.

      "Even if there are a million advanced civilizations in this galaxy, that doesn't mean that we'd know about them."

      Maybe, but if this is true you need to argue against one of the premises in the Fermi paradox. The argument itself seems to be valid, so you need to argue against it's soundness. Which premise is wrong then? It seems to follow logically from its premises.

      Take it to be:
      Premise: Mediocrity principle. Thus we are not special and as such if there are many civilizations many of them are more advanced then we are.
      Premise: Life has a tendency to overcome scarcity and colonize new habitats.
      Premise: Earth has been around long enough for a sufficiently advanced civilization to have densly colonized the area.
      Assume for the sake of reductio ad absurdum that there are many other civilizations. Then because of the previous premises we would expect to see sufficient evidence of them in the galaxy. We do not see sufficient evidence of them in the galaxy, so we have a contradiction. So we conclude that there are not many other civilizations.

      Notice this doesn't say there are NO other civilizations. This is merely an argument that if there are as many as people want to say there are (tons and tons of habited worlds with intelligent life beginning far before and far after ours) we should see them by now. Since we don't there can't be as many as people say. There could be some, just not a multitude.

    36. Re:More likely by 1u3hr · · Score: 2, Insightful
      If they were here in the first 99% of those 10 billion years, they would have missed us.

      The Fermi Paradox is that if they were here any time in the last 500 million years or so, thay would have colonised the place. Even if they subsequently went extinct here, it's hard to imagine a high-tech civilisation would not have left relics. Perhaps not every race feels the urge to do so, but Darwinism indicates that many will, and those will more than make up for any with qualms about pre-empting local intelligence from evolving.

    37. Re:More likely by quadelirus · · Score: 2, Insightful

      "Another possibility: aliens have visited us but have not revealed themselves to us. If their technology is so far superior to ours that it allows for space travel over great distances, it is also possible that they have managed to evade our attempts at detecting them."

      The problem here is that science deals with what we can verify expirementally or empirically. Now you have a belief system that is untestable. You are out of the realm of science. Your question now is no different than "Is there a God?" because it is purely a product of your philosophy and not expirementally testable.

      I see the Fermi paradox as saying that, the best conclusion we can reach through science is that there are no other life forms, because if the basic tenents of science are true, then we should have seen them by now. If you want to argue about unrevealed aliens, you aren't arguing against Fermi, because he only wants to talk science, not philosophy.

    38. Re:More likely by rudy_wayne · · Score: 3, Interesting

      There's more to this problem than just the issue of time. What if intelligent life exists in another galaxy (We have now identified more than 100,000 other galaxies in the universe.)

      http://math.ucr.edu/home/baez/physics/Relativity/S R/rocket.html

      According to the calculations in that article, using 1g acceleration someone from Andromeda (2 million light years) could reach us with only 28 years passing on board their ship. Sounds nice. Outside the ship, however, millions of years would have passed, which means that the visiting aliens would have had to leave their home planet before there was any human life on earth in order to arrive today.

      Also, the fuel requirement, assuming 100% efficiency, is 4000 tons of fuel for every 1 kilogram of ship weight. And that's only if the visiting aliens want to go sailing past us. If they want to stop and visit, they have to start slowing down at the half-way point of the journey, which means:

      1. They have to know exactly where they are going so that they know when to start slowing down. Coming from Andromeda, how would they even know that earth would be a desirable destination?

      2. It greatly increases the fuel requirement -- 4 thousand million tons of fuel per kilogram of ship weight.

    39. Re:More likely by rolfwind · · Score: 3, Insightful

      I am aware of no such science. You may be talking about some type of politics.

    40. Re:More likely by jc42 · · Score: 3, Funny

      If they were here in the first 99% of those 10 billion years, they would have missed us. We may be marked as a "potential revisit" but the likelihood of any existing lifeforms knowing that we are here is very small.

      Actually, if they are living (or have automated monitors) within a radius of roughly 80 light years, they know we're here. We've been broadcasting our presence via radio waves for about that long now, and our broadcasts are unmistakably "intelligently designed".

      Of course, it just might be that the speed of light is a hard upper bound that can't be violated in our universe. In that case, we might still have some time before visitors come calling.

      Our best bet is to continue scanning the skies for possible incoming messages (which might or might not be addressed to us).

      And hope it's not just spam ...

      --
      Those who do study history are doomed to stand helplessly by while everyone else repeats it.
    41. Re:More likely by HTH+NE1 · · Score: 2, Interesting

      Maybe this part of the galaxy isn't that great of a place to be. Maybe it's a nice place to evolve but you wouldn't want to move here. Perhaps we're not in the galactic "sweet spot" where interstellar distances are more favorable for travel, yet not too close to the super black hole at the center of the galaxy.

      To answer the question why extraterrestrial civilizations haven't colonized the whole galaxy you just need to answer the question why hasn't terrestrial civilization done it.

      Or are we assuming too much about the form of colonization; perhaps we're destined to colonize via panspermia. And has this already happened? And if so, have we in fact colonized the whole galaxy already with the consequence of resetting our own evolution each time in order to adapt to our new environments?

      --
      Oh, say does that Star-Spangled Banner entwine / The myrtle of Venus with Bacchus's vine?
    42. Re:More likely by quadelirus · · Score: 3, Insightful

      I said this in another post, but I'll say it again. I think that Fermi here is giving a scientific argument. This means that expiremental verifiability is important. If you are saying that WE are the aliens, then evolutionary biology seems to have a body of evidence that we happened by chance, and to argue against it you need to posit some untestable hypothesis like (aliens struck the lighting into the primordial soup in just the right way as to create life that they knew would lead to intelligent beings eventually.) If you are saying that they are here but we can't detect them, then you are making claims also outside the realm of science since we have no expiremental faculty to test your hypothesis. Either way Fermi is going to say that he is arguing that if we take science to be the only way we humans can reliably come to know truth, then we must conclude that there is not a sufficient number of intelligent civilizations in the galaxy. It is merely an argument from what we can reliably believe given our science. Now you can say that this is a weak point in science's ability to come to truth. Which I would agree with you. But you need to recognize that this same hole also allows for arguments to the existence of God and a mariad of other things that cannot be verified by science but may be believed to be true none-the-less.

      If you want to believe in undetectable aliens, then fine, but you have to realize that you are now asking a question of philosophy and not of science. Fermi is not saying that he has proven there can't be aliens, he is saying that the VERY BEST SCIENCE CAN DO, is tell us that there are countably few intelligent civilizations.

    43. Re:More likely by Dogtanian · · Score: 5, Insightful

      The speed of light is a real and unbreakable rule as a result nothing more than 4 or 5 light years away is reachable.

      There are at least two major issues with extra-terrestrial intelligence.

      Let's assume that they evolved independently of us. It is often said that- by the sheer number of star systems- that there are likely to be a very large number of potentially life-supporting planets elsewhere in the universe. Let's assume that this is correct, and further that life may have evolved on a proportion of them.

      Thus, the reasonable conclusion is that there is life "out there". Fair enough. Now; consider the timescale of the evolution of intelligent life on Earth. Very simple bacterial/single-cell type stuff for a large portion of that time. Moderately-intelligent creatures (dinosaurs, birds, etc...) evolving at slow speed for a very long time. Then- on the cliched "24-hour-evolutionary-scale"- mankind, the only organism likely to get anywhere near space-travel- appears at "five-to-midnight".

      Furthermore, although Homo Sapiens in their modern form have been around for 200,000 years, most of the progress made towards space travel hasn't been even; it's been very skewed towards the present day. Technological sophistication has been growing ever-faster, on a pretty-much-exponential scale; how much modern technology has been developed in the past 100 years (a lot)- how fast has computer technology developed in the past *30* years (an incredible amount- by many orders of magnitude(*).

      It doesn't take a genius to see where this is going. Around 10 years ago, I figured out by myself (**) that the next 1000 (if not closer to 100) years are likely to see more significant and fundamental changes in the nature of the human race than those since the dawn of human-like-intelligence.

      My point being this:- Yes, there may be many planets/systems out there capable of evolving and supporting life, and possibly many with life as we speak. However, if we assume that the evolution of life (and technology) follows broadly the same pattern elsewhere as it does on Earth, (very slow for a very long time, then an incredibly sudden surge in intelligence/development), then...

      Unless intelligent evolution (and its inevitable offshoot, technology) has independently reached the same "explosive" stage on one of those other worlds at *exactly* at the same time it has on earth (i.e. around the present day), they'll either be way behind us (at best.. primitive man? monkeys? horses?) or so far ahead of us that it's unlikely we can even speculate on where they'll have reached.

      Remember; our recent technological evolution has been very sudden relative to the timescale of mankind's evolution. In turn, mankind's evolution has been a sudden event relative to the history of life on the planet.

      So, the chances of independently-evolved life elsewhere having reached a comparable stage to us is similar to the chances of two independently-set 24-hour clocks purely coincidentally reading the same time to within a small fraction of a second. If they're more than a few seconds behind, they're nowhere near achieving space travel.... if they're more than a few seconds ahead, they're likely gods, as far as we're likely to be able to comprehend them.

      That's assuming they haven't made a fatal mistake as they progress on their exponential evolutionary/technological curve. As with mankind, by the time they've developed space travel, it's likely that they'll be developing sciences and technologies that have the ability (if not used carefully and responsibly), to wipe them out completely. If they're anything like us, their technological evolution will not be matched by social evolution, and there will be great danger that around the time of (shortly before or after) developing space travel, that they'll put a foot wrong and wipe themselves out.

      Back to the parent comment; if the alien intelligence has survived, and is more

      --
      "Slashdot - News and Chat Sites Deviant". (Click "homepage" link above for details).
    44. Re:More likely by Poltras · · Score: 2, Funny

      Maybe this part of the galaxy isn't that great of a place to be. I know of a place near M-627. Nice place, really. The grocery is right around the next solar system and there is a Supernova movie starting in 3,000 years, ideal for the kids. For those who want more action, I suggest P35, right accross the Black Hole. Life there is too fast for me though.
    45. Re:More likely by quadelirus · · Score: 3, Insightful

      Evolution in some sense requires the mediocrity principle. Humans are merely chance events in the universe and we should expect to find many other similar intelligent species around the universe. If humans were the only such outcome of evolution then the chance involved gets smaller and smaller. The smaller the chance that evolution could have occurred the more surprised we should be for finding that it has occurred. The more surprised we are that it has occurred, the more it seems to make sense that some necessary being (we can call him "God") is conducting things, possibly in ways we don't understand.

      For tradional materialistic evolution to work correctly we have to be just another chance occurrence with a "nothing to see here, move right along" sign tacked to our foreheads.

    46. Re:More likely by jc42 · · Score: 4, Informative

      Omni-directional radio of terrestrial origin has very little chance of ever being received in another solar system.

      Not nearly correct. Google for "Eavesdropping The Radio Signature of the Earth", the title of an article by W.T. Sullivan and C Wetherill in the Jan 27, 1978 issue of Science. You'll get links to a number of cached copies of it online, and also some discussions.

      One of the hits is to a NASA article on the same topic with updated info and some pretty graphs. It also contains the comment "On a cosmically infinitesimal time scale, Earth has indeed become a very bright planet, outshining the Sun by orders of magnitude in certain narrow frequency ranges."

      The general idea is that, first, our radio/TV/radar broadcasts aren't omni-directional; from the start our broadcasts have used antennas that broadcast most of their energy horizontally. The resulting 2-dimensional dispersion pattern reaches much farther than an omni-directional signal of the same energy would. Over time, each broadcast station does send in all directions, but from any one direction, the station appears to fade in and then fade out some minutes later, twice a day. The frequency is doppler-shifted due to the Earth's rotation, and also varies over a year due to our orbit around the sun.

      And, second, with our own technology, we could detect the most powerful our own broadcasts from anywhere within the sphere that they've reached. This was the basic question in the Science article. But they also addressed a more interesting question: Assuming our own technology, and the ability to measure the signal's spectrum but not decipher program content, what could be deduced about the senders? The results were quite impressive.

      Figuring out which star system the signals come from was trivial (to an astronomer). After a year or so of data collection, the planet's orbit would be known, as would the planet's size. The presence of a large satellite (including its orbit and approximate mass) would also be known. It would be clear that the senders are primarily active during the daytime and early evening.

      Further study would generate a rough map of all the broadcast stations. They would be concentrated in narrow bands separating two different sorts of terrain. From the planet's orbit and the sun's brightness, the conclusion would be that the planet is roughly 3/4 water and 1/4 land, and we live on land, primarily along the coasts.

      Even more study would determine from spectrum details that there were several different kinds of technology in use to generate the broadcasts, and each kind of equipment was distributed across patches of land that we might call "nations", with some kinds of hardware used by nations not close to each other, implying long-distance technological sharing among coalitions of nations.

      It was interesting reading 30 years ago. (But I do remember thinking that it might be a good thing if the actual program content couldn't be decoded. ;-)

      --
      Those who do study history are doomed to stand helplessly by while everyone else repeats it.
    47. Re:More likely by fyngyrz · · Score: 4, Insightful
      The Fermi Paradox is that if they were here any time in the last 500 million years or so, thay would have colonised the place

      Presumes:

      • Earth is the right distance from the sun
      • Earth has the right atmosphere
      • Earth has the right gravity
      • Earth doesn't have something common, which is toxic to them
      • Earth is somewhere they want to be (a spiral arm in the boonies)
      • Earth wasn't colonized, and we are it
      • Earth wasn't colonized, and dolphins (or something else, maybe cats or fleas) are the remains of it
      • Earth wasn't colonized, and they died out due to lack of vigor
      • Earth wasn't colonized, and they died out as a result of an asteroid, etc
      • Earth wasn't colonized, and someone else came along and took exception to it, and wiped them out
      • Aliens are interested in colonization (because we are - but that may not follow)

      ...and those are just off the top of my head. Just because you're qualified to push formulas around, doesn't mean you're an authority on aliens, for crying out loud. Some people - and clearly, Fermi was one - can't think their way out of a paper bag when they step outside their speciality.

      --
      I've fallen off your lawn, and I can't get up.
    48. Re:More likely by Mex · · Score: 5, Funny

      Hello,

      My name is Blorgflog Fleeberblox from the Indurian colony of Aran. After current civil war between Xzixi faction and Xlfrixi government, my father, General Zobb escaped with a 10,000 trillion credit box...

    49. Re:More likely by SnowZero · · Score: 4, Interesting

      I dunno, if I were an alien race, and had the choice of colonizing solar systems where the best planet was:
      (1) Teeming with constrantly mutating alien bacteria
      (2) Lifeless and ready for terraforming

      I know which one I would choose. Seriously, why risk alien disease when there are so many "clean" places to choose from? If you were looking for a cave to sleep in, would you choose the empty one or the one with animals already in it? Unless space travel is instant, I really don't see a race ever expanding fast enough to need to use every planet. Besides, it is selfish to think alien life is "as we know it" and would even care about our planet; If they aren't water-based our planet could seem like the same kind of hell that Venus seems to us.

    50. Re:More likely by spun · · Score: 5, Informative

      See? This is the kind of craziness I'm talking about. You have entered into an infinite regress. Where does this thing outside space and time come from? Either it arises from something else, or it is eternally present, or it is self created. If it arises from something else, nothing is answered, we just have added another layer to the question. If it is eternal or self created, why could the universe itself, which must be less complicated than any proposed creator, not also be eternal or self creating?

      This is so ridiculous and illogical: you posit that something as complex as the universe needs a creator, you posit a creator that must be more complex than its creation, and then you say that creator itself is not created by somethign else. Please try to see how insane this sounds to those of us who have not been infected by your mental virus.

      There is no responsibility that comes from being in a created universe. Just because somethin gcreated you does not put that thing in a superior position over you. It is in no position to dictate responsibility to you, to say that it is is another of those completely illogical things religion would have you believe.

      There is no lack of responsibility that comes from being without a creator. All real responsibility is a form of enlightened self interest. I don't need a creator to tell me to be responsible. If being responsible makes sense, I am perfectly capable of figuring that out on my own. Turns out it does make sense, creator or no.

      Whether or not there is a creator is a question that is completely seperate from the question of whether religion is a form of insanity. If there is a creator, it sure has done a piss-poor job of communicating its intentions in unambiguous ways to it's creations. Until said creator makes itself and its intentions known to me in a way that can't be faked by mentally damaged humans, the question of whether or not there is a creator is utterly meaningless.

      The question of the impact of religious insanity on human well being, however, is an important one that can be answered.

      --
      - None can love freedom heartily, but good men; the rest love not freedom, but license. -- John Milton
    51. Re:More likely by fyngyrz · · Score: 2, Insightful
      fuck you, mod. that is a serious question.

      Agreed, it was. However, you overlooked one factor: Slashdot moderators rarely display intelligence. Slashdot moderation is completely broken.

      Treating your sally seriously, I think that religion is just a successful subset of general superstition; and when you broaden the question to why would superstition be successful within an intelligent civilization, the answer is that before science is understood by the entire population, beings will look in the wrong places for explanations because it is very easy to do so. I really think it is just as simple as that.

      --
      I've fallen off your lawn, and I can't get up.
    52. Re:More likely by Anonymous Coward · · Score: 2, Insightful

      Why do you consider Creationism and common sense to be mutually exclusive?
      Because Creationism is antithetical to common sense. To be fair to you, it appears you're conflating Christianity with Creationism. Creationism is much more than "God created the heavens and the earth". Creationism is: "the earth was created in six 24 hour periods." Creationism is: "man and apes did not evolve from a common ancestor." Creationism is: "evolution can not possibly create new species." Creationism is: "the earth is no more than ten thousand years old." Creationism is "scientists who accept evolution are part of a huge anti-God conspiracy."

      So based on what you've said, you don't appear to be a Creationist. If you don't have any of these "whacked out" beliefs then you're not a Creationist, because they are truly and deeply wrapped around the post to the point that they're cutting off oxygen to their brains.

      There are "jihadis" that are even more rabid in their beliefs, but to say that all Muslims are equally closed minded is just as offensive as your argument.
      Again, you're conflating a subgroup (the violent jihadist's) with the whole religion.

      Creationists lack even a single ounce of critical thinking... Christians we should reserve judgement on.
      Violent jihadists deserve scorn and a firm defensive posture... Muslims we should reserve judgement on.

      However, I'll be completely honest and say that I'm pretty hostile to religion now that I've had a chance to really think through the issues. Fundamentally, the acceptance of mysticism as fact is the strongest negative influence for humanity, historically and in modern times. Being willing to set aside your own critical thinking and nonsense-filtering reason for what someone else wrote down in a book hundreds or thousands of years ago can have no good result for human happiness. And indeed, look at humanity's biggest problems around the globe (overpopulation, starvation, warlike states on the rampage) and look at where religious leaders stand in those debates (no condoms, no abortions, support for war as long as the leaders subscribe to their religion) and you'll see that we don't have to go back to the Spanish Inquisition to find religion as the leading sponsor of misery, death, and unhappiness.

      Now, to separate you, the individual, from your religion. Sure. Like anyone living in the US, almost all of the people I meet and interact with believe in some flavor of irrational mysticism, and I still have fulfilling and productive relationships with them. Even in my family, it's a small group of us who truly don't buy into mystical beliefs, but I still love my sister and mom and everyone else in my family, no matter what their beliefs. Am I sad that they believe what they believe about death and salvation? Yes, a little bit. Am I sad that they support leaders who use their beliefs as justification for widespread destruction and hate? Yes, to the point of anger.

      So I try not to think about that. Which works most of the time. Every once in a while, someone gets me into a conversation and gets really offended that I'm not a believer in their flavor of mysticism. These conversations usually end the friendship, so I try to avoid them if at all possible.

      Regards,
      Me (posting anonymously because this published statement may harm me in the future if my name is on it...)
    53. Re:More likely by Deadstick · · Score: 2, Funny
      Actually, if they are living (or have automated monitors) within a radius of roughly 80 light years, they know we're here. We've been broadcasting our presence via radio waves for about that long now, and our broadcasts are unmistakably "intelligently designed".

      In which case, there may be a big sign on the back side of Pluto saying QUARANTINED -- DO NOT ENTER.

      rj

    54. Re:More likely by amorsen · · Score: 2, Insightful

      More seriously, broadcast radio is probably a blip

      Quite possibly. However, radar seems likely to be around for a long time. Incredibly powerful signals, very easy to detect.

      --
      Finally! A year of moderation! Ready for 2019?
    55. Re:More likely by cytg.net · · Score: 2, Interesting

      yall is realling missing the point of this excersice.
      machine intelligence is the next logical step in our evolution, and at this point there's really very little reason in reasoning about a machines reason to 'spread and multiply', or other stereotyped carbanoid evolved behavorial patterns.. Also, if indeed have had or do have or will have some connection with intelligence 'out there', i can only deduct it will be of mechanical origin.. the biological construct is just too fragile on so many levels. If i was a machine intelligence i could imagine looking at earth like a egg ready to hatch .. you dont emulate hundreds of millions of years evolution like us, and mayhaps a little different kind of AI will spring each time an egg hatches.. adding to the family.. who knows!

    56. Re:More likely by PieSquared · · Score: 2, Insightful

      You've got your logic all wrong. ID can be tested... but it can't be disproved. We could look at our DNA and see proof that we were created. We could see "tags" that never change, or a really consistent encoding or maybe (in the "fluff" that doesn't do anything) we could find a thousand digit of pi (in base 4). But since we don't see anything like that, it doesn't prove that we *weren't* designed.

      The same can be said for radio. You could find, for example, that one small planet is emitting high powered radio signals outside the typical ones floating around space. You might find that these signals reside specifically in the small band that is useful for long range communication, as they can accept other signals on top of a consistent "carrier" signal. You might see that, in fact, there are evenly spaced carrier signals started emitting 80 years ago and haven't stopped since. And that is what anyone listening with the right instruments would hear.

      On the other hand, you might not find any of those things. There could still be a signal, of course, but if it was made like a military signal... with frequency hopping and encryption and a high noise to signal ratio... there wouldn't be any of the obvious signs that it was intended to carry a signal.

      What makes ID not a science is that it can't be *disproved* not that there is no possibility of proof. You can make a radio wave (or life form) and include a specific signature that proves it was designed, not random. Take my example of pi, for example. You can't look at a radio wave (or life form) that was *not* signed in some way and say "this wasn't created" and you *certainly* can't look at a life form or radio wave designed specifically to look like background radiation or evolved life and say for sure "this was not created."

      --
      Does a line appended to your comment give your post meaning in and of itself, or only in relation to those without?
    57. Re:More likely by Maxo-Texas · · Score: 2, Insightful

      Actually, religion would probably be one of the only ways we get off this rock.

      If you somehow made it a religious requirement to get to the mars and enough people bought it, they would get it done. A comparable number of independent thinkers would not be able to align themselves in a single direction to get it done. Religion does have a marvelous capacity to align the behavior of huge numbers of individuals.

      Example: More katrina repair work has been done by religious organizations even tho the have less government money. I have religious friends who have spent a couple weeks now going and building houses. If I want to help, the only avenue I have is to join a religious group going to help. Government work is restricted to contractors and non-believers are too disorganized.

      Example: Millions of people make it to mecca and the ganges river independently every year without any central organization other than their religion.

      Religion allows people to do things that would otherwise be insane. So the right religion might get us to the stars.

      --
      She was like chocolate when she drank... semi-sweet at first and then increasingly bitter.
    58. Re:More likely by Jeremy_Bee · · Score: 4, Informative

      I don't think Fermi is talking about mere visits, but colonization. Actually this is wrong. The "Fermi paradox" was just a response by Fermi to someone else's argument at a dinner party. The argument was in regards the numbers from Drake's equation and the hypothetical exploration of the galaxy by an alien species. Fermi's response to this construction was simply the statement "So, where are they?"

      Fermi specifically did not refer to colonisation at all (at least in the original formulation of his remarks), he also never explicitly stated the theorem he is so famous for. He merely pointed out the obvious which is that if the theory of space colonisation and the numbers being associated with it were true, then the hypothetical aliens "... should be here by now."

      While the Fermi paradox has been used over and over as a means to prove that alien civilisations don't exist (because they are not here already), Fermi was actually more interested in pointing out the faulty data than he was interested in using this so-called paradox as proof of the concept that we are alone in the universe. While that may have been the agenda of many that followed, there is no indication that Fermi himself had a strong opinion one way or the other.

      It's not so much a paradox as an attempt to point out that either something must be wrong with the numbers, or with our powers of observation. There are just as many solutions to the paradox that involve us being alone as there are ones that do not.
    59. Re:More likely by SatanicPuppy · · Score: 2, Insightful

      I don't see how that follows. Improbable things happen all the time, what's one more? And the actual probability over time is pretty high...I mean, life exists practically everywhere on this planet...The most barren, desolate spots imaginable, they all have life. As far as we know, life is quite common in the universe...Intelligent life, maybe not.

      Extrapolate from that to the whole universe, and say that it's probable that nowhere else in the whole universe has another species done what we have done?

      I'm sure it irks the hell out of people who are wedded to the idea that they're little unique snowflakes that just happen to be genetically identical (+/- .001%) to nearly every other unique snowflake in the fricking world to think that we might not be utterly special in the cosmos. But how often in nature do you see one of something?

      --
      ad logicam Claiming a proposition is false because it was presented as the conclusion of a fallacious argument.
    60. Re:More likely by nbritton · · Score: 3, Funny

      "I believe the correct term is "Mostly Harmless""

      Mostly harmless? Is a chimpanzee with a bible in one hand and a loaded gun in the other mostly harmless?... If I were an alien, I'd stay as far away from earth as possible.

    61. Re:More likely by Mattsson · · Score: 2, Insightful

      No. If it turns out that the chance of intelligent life evolving is that low, the likelihood of some kind of überpowerful being capable of creating intelligent life on an arbitrary planet in the universe (A "god") evolving would be even lower.
      Claiming that something must have created us would only move the problem one step farther away.
      Even if we where created by a "god", that isn't an answer to the question how we came to exist. It only transforms the question into how that being came to exist.

      --
      /.Mattsson - My native language is not English, so please don't whine over linguistic errors. (That's lame anyway...)
    62. Re:More likely by XantheKnight · · Score: 2, Insightful
      ad logicam indeed. This is a fallacious argument on several counts.

      Firstly, even as we know it, evolution (as a theory and "observed" phenomenon) applies only to our current earth environment; we simply have no evolutionary data available for other non-earth-like environments. It seems from current data that most environments in the universe are not earth-like. Therefore, any conclusions about the frequency of evolution in the universe as a whole are invalid, not only because we don't even know everything about evolution yet, but also because we know comparatively little about the universe, too.

      Secondly, the "surprise" aspect is irrelevant to the liklihood of the existence of god. If there is a non-zero probability of an event occurring (in this case evolution of an intelligent civlisation other than human beings), the chance of encountering this event approaches 100% as the size of the environment tends towards infinity. So, if the universe is really damn big, we should be the opposite of surprised if and when we finally encounter another intelligent civilisation. The bigger the universe, the more inevitable such a discovery becomes.

      On a side note, I'd also shrink at calling evolution (or humans) a chance occurrence. Gene mutation, debatably perhaps, but not evolution. Evolution in a colloquial sense is when a gene mutates - maybe by chance, maybe not- and results in an improved ability to survive in a particular environment. Therefore there is a certain deterministic aspect of evolution: if the mutation doesn't help the organism survive, significantly, it doesn't propagate significantly. If it does help, then it gets propagated, and the genetic evolution of populations occurs.

      Even before genes existed in organisms, again, we know so little about what "sparked life", if it even ever sparked as such, that attributing to chance something that may in fact be entirely deterministic, even inevitable, would be illogical. Similarly, even if the process is deterministic, that doesn't mean there's a god. It might mean there's a fundamental law of the universe about which we're just not aware (yet).

      Naturally, all of the above is a very simplistic description of very complex processes, but hey, I'm not evolutionary biologist.

    63. Re:More likely by rbanffy · · Score: 3, Insightful

      Remember intelligence is only one way to solve the problem of keeping your species away from extinction.

      Sharks are very dumb and have been doing just fine.

      It is perfectly possible to imagine a universe full of life and yet with very few intelligent multi-planetary technological civilizations.

      We are smart because we could not outrun (our outbite) our predators. We had to evolve other way.

    64. Re:More likely by Maxo-Texas · · Score: 2, Interesting

      When i consider it, machines seem the only likely real star travellers.

      They "live" long enough, can eventually be repaired easier, they are likely to remain sane, and they can be safel shut off/stored so centuries of travel passes in an instant to them. They could probably travel to stars at .001C (4,000 years to alpha centauri) without major life support in fairly tiny packages.

      I almost think if we are going to send humans, a first step would be breeding for 2' tall humans (there's no reason humans have to be big to be as smart as they are).

      --
      She was like chocolate when she drank... semi-sweet at first and then increasingly bitter.
    65. Re:More likely by rbanffy · · Score: 2, Insightful

      This, as someone else put it, is a xeno-psychology thing, not a technology one.

      Colonization is likely only if the civilization visiting considers it desirable.

      If you are a nearly immortal living spaceship (or an alien who was born in space - maybe bred to live in space) why would you want to settle down on a warm planet with a semi-corrosive atmosphere populated with semi-intelligent, self-replicating bags of jelly? It's not likely you would consider green grass under a blue sky something worth exploring.

      To rephrase the question in human terms, why would you want to hop off your car in the middle of your trip to work, settle down and start a new life in a cold mud pond?

    66. Re:More likely by drsmithy · · Score: 2, Insightful

      Consider how far we've come in the last few hundred years. Consider how far along we'll be in a thousand years.

      Now consider the few thousand years _preceding_ the last few hundred.

    67. Re:More likely by Deviant+Q · · Score: 2, Interesting

      It comes down to how probable you think it is. If it is probable that we should have evolved the way we did... Mmm, are you familiar with the definition of probability? Because the probability of something that has already happened, having happened, is 1. That is, the probability that we evolved in the way we did is 1. Probabilities are observer-dependent things, and change with new information or events.

      What I'm saying is that the anthropic principle applies. It could have been, pre-our-evolution, that the probability of our evolution was 0.000000001. But now, post-our-evolution, the probability is 1. So we can't really make arguments are about "how probable" it is that we evolved the way we did, and what that implied, because the number could have been completely arbitrary---anything inside the interval (0, 1]. The information of what that number was is lost to us, however, since now that number is 1.
      --
      "May the days be aimless. Let the seasons drift. Do not advance the action according to a plan."
    68. Re:More likely by 1u3hr · · Score: 2, Informative
      Just because you're qualified to push formulas around, doesn't mean you're an authority on aliens, for crying out loud.

      Fermi's argument was statistical. True, much is based on a single data point, us, but most of your quibbles would imply a species that wasn't interested in exploration at all.

      Your points:
      Earth wasn't colonized, and dolphins (or something else, maybe cats or fleas) are the remains of it Earth wasn't colonized, and they died out due to lack of vigor Earth wasn't colonized, and they died out as a result of an asteroid, etc Earth wasn't colonized, and someone else came along and took exception to it, and wiped them out

      Presumably you meant "was" not "wasn't", and these aren't convincing. If any civilisation had been established here any time in the last 500 million years, we WOULD know. We've got hundreds of T-rex skeletons, would an intelligent species leave less? Cities, metals, glass? Moonbases? And it's hard to think of a catastrophe that would wipe out an intelligent species completely, yet leave the planet intact enough to end up with us. And biologically, there would be whole animal kingdoms completely unrelated to native life. There has been some weird stuff found, but nothing that came out of nowhere; we all go back to the same genetic roots. We share most of our genome with "dolphins, cats and fleas". (But thanks at least for not bringing up the "we are aliens" argument.)

    69. Re:More likely by bar-agent · · Score: 2, Funny

      It also you means your grandfather throws his own poo.

      Well...he's old. Come on, cut him some slack!
      --
      i'd hit it so hard, if you pulled me out you'd be the king of britain [bash.org]
    70. Re:More likely by Eivind · · Score: 2, Insightful
      You're overstating the vulnerability. Yes, we're vulnerable, in the sense that lots of disasters have the capability of setting us back decades or centuries. But there's a long way from there to extinction. And there's a long way from being set back a century and to the stoneago too, for that matter.

      The middle-ages was a few hundred years of stagnation, with some lost tech and knowledge in some areas, and some minor discoveries in other. It also was before the start of the scientific revoloution with systematic gathering, storage, duplication and disemmination of knowledge.

      You could kill 99% of the population of USA, and give the remaining ones *nothing* other than the clothes they're wearing at the moment, wait 100 years, and have a civilization more advanced than many in the world today -- certainly nowhere even *near* stone-age level.

      Meanwhile, dozens of species of shark are endangered, some of them critically so, mainly as a consequence of a very minor human activity. We'll need luck to avoid extinct shark-species in the next few decades, quite *without* any disasters.

  2. Only two choices. by AJWM · · Score: 4, Interesting

    "Remain on Earth" and "become extinct" are not distinct choices. As Heinlein and numerous others have put it, the Earth is too small and fragile a basket for humanity to keep all its eggs in.

    It's not so much a matter of "if" but of "when". Ask the dinosaurs.

    --
    -- Alastair
    1. Re:Only two choices. by flyingsquid · · Score: 3, Interesting
      The dinosaur argument doesn't hold water. Turtles, salamanders, crocodiles and pike all survived the extinction, and none of them had, to my knowledge, any kind of a space program. What killed the dinosaurs was that they had high food requirements- being large and warm blooded- didn't have the ability to store food, and then the ecosystem collapsed. We, on the other hand, do have the ability to anticipate asteroid impacts and store food.


      The best way to survive a Chicxulub-style impact is the Dr. Strangelove model. Get an underground complex to ride out the initial fallout of red-hot debris, have a nuclear reactor for power, some parkas for ventures outside into the cold, food to survive for 10-100 years, a force to defend it from looters, and store up the machinery needed to start reestablishing an industrial civilization when things have recovered. It wouldn't even have to be a terribly large population, since you could have a bank full of ten thousand frozen embryos to maintain adequate genetic diversity.

      Concievably there are threats where a space program is the logical answer- say, the sun goes supernova- but an asteroid impact just isn't one of them.

    2. Re:Only two choices. by AJWM · · Score: 2, Insightful

      The dinosaurs didn't have technology.

      Which is why they're not around any more.

      Most likely, an asteroid the size of the one that killed the dinosaurs won't hit us for a million years or more.

      And you base that estimate on what, exactly? Besides, even if you're correct on the odds, it's still a probability calculation -- one could hit us next week, we haven't tracked any but a fraction of a percent of the big rocks out there. But big rocks hitting the Earth aren't the only problem: a nearby gamma ray burster could do sufficient damage, and Eta Carinae (for one) is going to go "real soon now". Then there are the home-grown hazards -- runaway greenhouse, global thermonuclear war, the whole doomsday scenario litany. Perhaps none of them likely, but none of them in the "we don't need to worry about it for a million years" category either.

      You really think we won't be able to do anything about it?

      Not with attitudes like yours, we won't. We'll keep on figuring that it's some future generation's problem, or that there'll be plenty of warning. No doubt the occupants of Pompeii and Herculaneum felt the same way.

      --
      -- Alastair
  3. Re:Remain for how long? by nurb432 · · Score: 4, Interesting

    The universe wont last forever either.

    --
    ---- Booth was a patriot ----
  4. Fermi paradox by HTH+NE1 · · Score: 2, Insightful

    If spacefaring civilizations exist, they should have colonized the galaxy by now.

    Earth is a spacefaring civilization.

    Earth hasn't colonized the galaxy by now.

    Ergo, Earth doesn't exist.

    So say we all.

    --
    Oh, say does that Star-Spangled Banner entwine / The myrtle of Venus with Bacchus's vine?
    1. Re:Fermi paradox by ScentCone · · Score: 2, Funny

      Earth hasn't colonized the galaxy by now. Ergo, Earth doesn't exist.

      Excellent. That means I don't have to sweat the deadline on that network redesign thing I've been fighting with. Thanks!

      --
      Don't disappoint your bird dog. Go to the range.
    2. Re:Fermi paradox by Chacham · · Score: 2, Funny

      If spacefaring civilizations exist, they should have colonized the galaxy by now.

      Earth is a spacefaring civilization.

      Earth hasn't colonized the galaxy by now.

      Ergo, Earth doesn't exist.

      So say we all.


      If a decent slashdot comment exists, it would generate a decent response.

      Your comment was a decent slashdot comment.

      Your comment has not generated a decent response.

      Ergo, your comment doesn't exist.

    3. Re:Fermi paradox by mcvos · · Score: 3, Insightful

      I agree with this parent post. It's pretty silly to assume that "if spacefaring civilizations exist, they should have colonized the ENTIRE galaxy by now." What about evolution time? Time to develop technology? Time to establish colonies? etc etc etc...

      If another civilization was even dramatically ahead of ours with regards to technology, they could have started, what, 10,000 years ago? 20? Think that's enough time to colonize THE ENTIRE GALAXY??? Come on...

      Think 20 million years. Or 200. Or billions, even. 10,000 years is not being dramatically ahead, that's being barely older than we are.

      Consider the enormous timescale of evolution. Earth has existed for about 4.6 billion years. Compared to that, a few million years is nothing. What if the meteor that killed the dinosaurs had arrived a few million years earlier? Or later? Why did evolution take a billion years to get cells past the prokariotic stage? Could that have happened a few million years faster? Or is that step so unlikely that most planets never make it?

      Furthermore, consider the age of the universe. The universe is about 3 times as old as the earth. Why couldn't an earth-like planet have appeared 5 or 6 billion years ago? There are good reasons why such a planet can't have appeared 14 billion years ago, but what about 7? That'd give any civilisation arrising on that planet an immediate 2 billion year headstart on us.

      Is that enough to conquer the galaxy? If it isn't, nothing is.

    4. Re:Fermi paradox by JebusIsLord · · Score: 2, Insightful

      Human civilization has been around for a microsecond in time, relatively speaking. Other civilizations would almost always be far, far more advanced than us, simply because it would be difficult to find a civilization that has a SHORTER history. So yeah, generally speaking, if spacefaring civilizations exist, they've probably been trauling the universe for millions of years now. We're still stuck in that brief little instant between first conciousness and technological maturity.

      --
      Jeremy
    5. Re:Fermi paradox by Pedrito · · Score: 4, Interesting

      I agree with this parent post. It's pretty silly to assume that "if space faring civilizations exist, they should have colonized the ENTIRE galaxy by now." What about evolution time? Time to develop technology? Time to establish colonies? etc etc etc.

      Actually, the Fermi Paradox takes all that into consideration. The time to colonize the galaxy, once a species has become space faring is minuscule in comparison to evolution. The paradox is based on the idea that the space faring civilization will colonize the galaxy before other species have a chance to evolve and the probability of two space faring civilizations existing at the same time is incredibly low.

      If another civilization were to have started colonizing the galaxy, it's unlikely it would have been in the time periods you point out, 10,000, 20,000 years ago. It's more likely they would have begun tens to hundreds of millions of years ago, and yes, that is enough time to colonize the entire galaxy.

      The Earth is believed to be about 4.6 billion years old. Life emerged in the first few hundred million years, probably around 4 billion years ago. Multicellular life sprung up around 1 billion years ago. Mammals have been around for about 200 million years. Homosapiens started out, probably around 200 million years ago. Now, let's say that instead of taking 3 billion years to go from single cell to multi-cell, it only took 2.5 billion years. That's a 500 million year head start. And there's no reason to think that's impossible. It's believed that the evolution of multi-cell was likely a fluke and not necessarily a forgone conclusion, largely because it took so long to show up. So that "fluke" could have probably happened any time after single-celled life began (well, any time after the first few hundred million years of it, at least).

      Also, intelligence isn't necessarily a forgone conclusion of evolution. Dinosaurs had a lot more time to evolve than we have and they never developed our kind of intelligence. So let's say an animal in the dinosaur period had developed intelligence. That was over 65 million years ago. Plenty of time to colonize the galaxy.

      The time to colonize the galaxy would, with only modest technological advancement from where we are now, would probably be a few million years. A very thin line on the timeline of evolution.

    6. Re:Fermi paradox by Pedrito · · Score: 3, Informative

      Woops, meant 200 thousand years ago, not 200 million years ago, for humans. My bad.

    7. Re:Fermi paradox by meeotch · · Score: 2, Funny

      Don't sweat it - I totally know what you mean... sometimes it just feels like we've been stuck here together that long.

  5. The fermi paradox is wrong by Viol8 · · Score: 3, Interesting

    Any intelligence advanced enough to reach Earth from another star system (or dimension?) would easily be able to disguise their presence so we couldn't see them but they could still study us. Just because aliens might exist doesn't mean they'd want to interact with us - thats taking a very human centred view of their motives. For all we know they could view us as barely above pond life in the scale of celestial intelligences and so interaction with us for them would be like us trying to have an interesting and meaningful conversation with an insect - a waste of time and effort.

    1. Re:The fermi paradox is wrong by roman_mir · · Score: 2, Funny

      Someone watched way too many X-Files episodes I think. The Truth Is Out There, Trust No One, Deny Everything and I Want to Believe are really great slogans, but they don't make it the case that aliens even bothered to leave their solar systems and go somewhere to give some strange creatures across the galaxy some anal probing. Of-course if anything did move us towards colonization of the Galaxy, Hot Alien Porn would be the most likely reason to do it.

  6. Re:The real choices: by HTH+NE1 · · Score: 2, Funny

    You forgot choice zero:

    0. Blow up the Earth and become extinct right now.

    --
    Oh, say does that Star-Spangled Banner entwine / The myrtle of Venus with Bacchus's vine?
  7. The paradox with the paradox by twifosp · · Score: 4, Interesting
    The math used in the paradox is flawed. It only contains a linear probability using only one variable: quantity. Wikipedia states that there are an estimated 250 billion visible stars in the milky way and 70 sextillion in the visible universe. What it does not take into consideration is time. For every lightyear of distance a potential life carrying solar system away from Earth is, a year is subtracted from the amount of time it took that potential system to reach space maturity.

    In other words, it has taken primates some-odd half a million years to evolve into humans capable of inventing devices that can decipher energy waves from space. It has taken the Earth some 200 million years (from early life to humans) to evolve life on this scale. Assuming other planets have roughly the same time scale, we can only assume those planets inside a 200 (give or take a 100) million lightyear radius contains no life.

    The paradox with the paradox is as follows: Earth contains intelligent life. Earth has not colonized the galaxy. Earth's evidence in space only reaches back into the 1930s when the very first signals were sent into space.

    1. Re:The paradox with the paradox by mcvos · · Score: 5, Insightful

      In other words, it has taken primates some-odd half a million years to evolve into humans capable of inventing devices that can decipher energy waves from space. It has taken the Earth some 200 million years (from early life to humans) to evolve life on this scale. Assuming other planets have roughly the same time scale, we can only assume those planets inside a 200 (give or take a 100) million lightyear radius contains no life.

      You're forgetting the age of the earth and the age of the universe. The universe was already over 10 billion years old before earth came into existence. Even if every other earth-like planet really needs at least 4.5 billion years too evolve an advanced civilisation, I still don't see why such a planet couldn't have formed one or two billion years before earth has.

      The odds are really simple: if the evolution of intelligent civilisations is likely, then some of those must have a multi-million year headstart on us. Why aren't they here? The possibilities are limited:

      • Our evolution is sufficiently unlikely that we are one of the first (someone has to be, after all),
      • It's completely impossible to colonise other solar systems,
      • Advanced civilisations that are aggressive enough to colonise space are too aggressive to not wipe themselves out before they get there,
      • Somebody is protecting us/has quarantined us/is keeping us isolated for whatever reason.

      Could be there's a few other options, but basically they all boil down to: we're incredibly lucky, or we're doomed.

  8. "The Great Filter - Are We Almost Past It?" by Jerf · · Score: 5, Interesting

    For what I consider a much better treatment of this topic, see: The Great Filter - Are We Almost Past It?

    This stuff is a big deal, and the Great Filter paper actually manages to draw some useful concrete conclusions from the question, or at least useful concrete questions.

    Also related, albeit a little more tangentially, is "Are You Living In A Computer Simulation?". "We're in a simulation and there are no extraterrestrials in the simulation" must be considered one of the leading possible answers. (I'm not advocating it either way, I don't have an answer. Nor do I consider this post anywhere near a complete list, just some relevant pointers.)

  9. Sigh.. by kraemate · · Score: 2, Funny

    Well, what's the use of wondering about so far into the future? I feel too depressed reading about it. Oh no, i'd rather be upset when they say that all crytography algorithms will be cracked within 10 million years, and someone will crack my password and start posting with my uber-low slashdot UID (remember folks, we are talking about ~1000000 AD here).

  10. Intelligence is Improbable by radtea · · Score: 3, Insightful

    Webb's 50th solution is the one that he believes is the most likely. Unfortunately for extraterrestrial enthusiasts, the solution is depressingly pessimistic: "...the only resolution of the Fermi paradox that makes sense to me--is that we are alone." Webb's preferred solution is highly controversial, but it satisfies Ockham's razor; out of all the Fermi paradox explanations, it is the simplest one. On the other hand, the solution is only as good as the evidence it is based on. New evidence could lead to a different solution to the paradox.

    Fermi's Paradox isn't really a paradox, it's a question: "Where are they?" One possible answer is, "They don't exist." It seems probable that as we explore the galaxy we will find life everywhere, and intelligence nowhere.

    The evidence for this is very strong. For one, there is the fact that we see no evidence for them at all. For two, life on Earth shows us that the kind of intelligence that builds spacecraft is extremely unlikely to evolve.

    Evolution routinely produces some complicated solutions to common problems over and over again. The eye has (probably) evolved many, many times. Wings have certainly done so, as have fins. Everything we know about natural history on Earth tells us that evolution by variation and natural selection will produce the same solution to the same problem with very high reliability. This is even true of things like extra vertebra in the necks of some Central American lizard: there are a couple of species that have this feature, and previously they were thought to have a recent common ancestor. Gene sequencing shows this is not the case--it is merely a result of common evolutionary pressures on similar forms having similar results.

    Human intelligence, on the other hand, seems to be something of an evolutionary fluke. Our ancestors were a marginal species of mediocre tool users for hundreds of thousands of years before we suddenly started on our current course about fifty thousand years ago, with the Upper Paleolithic Revolution. If intelligence was even just ten times harder to evolve than eyes and wings, it would have occurred more than once in the entire history of the Earth.

    Until someone comes up with a compelling account as to why human-style (i.e. machine-building, empire-building, world-colonizing) intelligence should be anything other than incredibly rare, there really isn't any other reasonable answer to Fermi's Question.

    --
    Blasphemy is a human right. Blasphemophobia kills.
  11. NOT being honest! by ScentCone · · Score: 4, Interesting

    we're too small minded to colonise the galaxy

    We weren't too small minded to risk lives hiking over mountain ranges or floating in very-likely-to-sink boats across open ocean to other continents, remember? Primitive Asians floating across the Pacific to populate South America or hoofing it in across the northern straights were taking on something at least as dicey as we currently see activities in space. Villages wiped each other out, disease killed off whole tribes - all of the stuff that people say would keep us from colonizing elsewhere. Sure, some of those efforts would fail - just as they have for tens of thousands of years. But some will succeed, too.

    we use our resources to make trivial things that amuse us for a short period of time (ipod, iphone, etc)

    That's because we evolved from, and still are short-lived primates. Our brains were wired to deal with much more short-term issues. Planning through the coming weather change is about as far as we ever needed to go, mentally. Only some people have the wiring to do big picture stuff... and guess what: they tend to get jobs doing big picture stuff. As for trivial things like iPods: you'd rather have a society with somewhat better antibiotics, but completely absent all of the things that make life a pleasure? The iPod is just a newer take on cave painting and tribal dancing. The fact that we evolved into creatures that put handprints on walls and invent group songs to sing doesn't mean we can't also do things like invent solar cells, fly transplant organs through the air to another city where they're needed, or manage to live past 25. Being productive, inventive, and joyous are not mutually exclusive - they're interdependent.

    rather than doing useful things (cure diseases, etc).

    I'm sorry to hear that you died of Polio. Or was it Smallpox? Or maybe spoiled food because we haven't invented refridgeration yet. Anyway, sorry you died.

    --
    Don't disappoint your bird dog. Go to the range.
  12. Re:Remain for how long? by frakir · · Score: 2, Interesting

    Asimov's take on the subject: http://infohost.nmt.edu/~mlindsey/asimov/question. htm is one excellent short story...

  13. More too it than intellect by gentimjs · · Score: 2, Interesting

    I'd wager that one more informed than I could argue that some elephants have higher intelligence potential than some humans. Whales too, perhaps? The issue is, thier physical form doesnt allow them to -DO- anything WITH that intelligence ... we got lucky with our opposable thumbs ....

  14. Re:Remain for how long? by Lijemo · · Score: 2, Insightful

    As far as I remember, the universe *could* last forever... It's kind of another paradox, but it seems it won't collapse....

    Well, even by the theory that says the universe will expand forever, any civilization that survived along with it would need to figure out how to survive

    1. All the stars using up their fuel and burning out, leaving complete darkness
    2. All matter eventually being sucked into black holes
    3. All matter eventually evaporating out of the black holes as sub-atomic particles
    4. The decay of all protons, since the conditions to create more haven't existed since very early in the universe's history, and while they last a long time, they don't last forever

    I'm having a hard time imagining a civilization managing to last until the time when the universe consists entirely of sparsely scattered electon-positron pairs slowly circling each other...

  15. Re:NASA Called... by ZachPruckowski · · Score: 5, Funny

    For some reason, they don't take orders from somebody on Slashdot with a 900k+ user ID.

    Does that imply that there exists a person on Slashdot with a sufficiently low UID to give orders to NASA?

  16. It's our Manifest Destiny! by dpbsmith · · Score: 4, Funny

    Clearly, then, humankind has the right, nay the obligation to expand throughout the universe.

    We should terraform any planets that are not already Earthlike, use the energy of however many stars it takes to achieve our goals, and find some black hole into which to pitch any planets that become inconveniently polluted.

    Any semi-intelligent life we encounter along the way will obviously be inferior, since it has not colonized the universe first. If it gets in our way (or even if it doesn't) we should trample it under our jackboots, but only if necessary. Whenever possible we should altruistically force them to accept the inestimable benefits of the English language, democracy, and McDonald's hamburgers.

  17. Re: This paradox is full of holes... by Smallpond · · Score: 3, Insightful

    By far the most successful animal species on Earth is the ant. They have exactly the type of determination that you describe. Imagine a technologically advanced species with similar attitude - every individual has a pre-determined role supporting the species plan of conquering every available planet. As for revolts and warfare, there is plenty of war between different ants. Hasn't prevented them from becoming the dominant type, on the order of 1/4 - 1/3 of the total animal biomass.

  18. Re:Remain for how long? by anorlunda · · Score: 2, Funny

    Quite true. The upper limit for how long we can stay on earth is about 1 billion years. After that the sun turns red giant and the earth is engulfed below the sun's surface.

    One should point out that survival and colinization by our species does not require transport of any individuals. We need merely to transport DNA of our species (plus whatever companion plant and animal species desired). A space probe loaded with DNA might weigh only a gram or so.

    If one hypothesizes that other intelligent species exist, then we need only to transmit our DNA code via radio. A receiving species could then directly sythesize humans from the code plus the easy-to-follow instructions included. If they did so however, I might question the quality of their intelligence. We need to fool them somehow by sending messages that entice them to "click here" despite better judgement. That's it! The future of mankind rests in the hands of spammers.

  19. Science Fiction answers the Paradox by unfortunateson · · Score: 3, Interesting

    1) "Accelerando" by Charles Stross: Civs advanced enough to create computing will shortly turn all of their available power (the sun) into shells of 'computronium', each operating off the waste heat of the one inside it. With nearly infinite virtual worlds at your disposal, why go anywhere else?

    2) "Berserker" by Fred Saberhagen: There are civs out there, but they're really, really quite to avoid being noticed by fleets of robotic intelligences sworn on eliminating all biological intelligences

    3) "Quaarantine" by Greg Egan: We're cut off from the rest of the galaxy until we prove ourselves. What we're seeing of the sky is cleverly only showing what they want us to see.

    I'm a bit of a fan of the "We're living in a computer simulation" theory too: since in the future there will be enough computing power to simulate a huge number of realities, the odds are greater that this is a simulation than that it isn't. It would also explain why socks disappear from the dryer, my car keys aren't where I left them, voting irregularities, etc.: Microsoft has got its hand in the kernel somewhere.

    --
    Design for Use, not Construction!
  20. There is nothing as unusual... by BerntB · · Score: 2, Insightful

    If they were here in the first 99% of those 10 billion years, they would have missed us. We may be marked as a "potential revisit"

    The problem with that argument is that nothing is as rare as an unused resource around life.

    If they had been here the last few hundred millions years, there would probably be lots of obvious signs of industrial work visible in any telescope.

    (Of course, there might be "hunter" aliens and wars, so a low profile is important. If so, the relativistic antimatter rockets should soon arrive...)

    --
    Karma: Excellent (My Karma? I wish...:-( )
    1. Re:There is nothing as unusual... by Fastolfe · · Score: 4, Insightful

      Unless it is their goal not to disturb? A civilization sufficiently advanced that they're going around inspecting and cataloging life around the universe is almost certainly sufficiently advanced to hide their presence from the subjects they're studying.

    2. Re:There is nothing as unusual... by hswerdfe · · Score: 2, Interesting

      If they had been here the last few hundred millions years, there would probably be lots of obvious signs of industrial work visible in any telescope. er..ummm Saturn's Rings?

      Jesus H. Vishnu! Do I have to do all the thinking?
      --
      --meh--
    3. Re:There is nothing as unusual... by AndersOSU · · Score: 3, Insightful

      So after reading through a bit of the comments to this article I gather that the collective wisdom of slashdot thinks that the state of extra-terrestrial life basically looks like some combination of Star Trek's Prime Directive, Babylon 5/ SG1's elder races, and Might and Magic's this colony forgot about technology motif.

      I don't know why that surprises me...

      Seriously, SciFi has so many holes in it that become quite obvious even as the story plays out, we shouldn't be extending out fiction to the universe.

      If there is extra terrestrial life capable of FTL travel, wouldn't it stand to reason that it would put out colonies? Wouldn't it become successful by gathering resources when and where it can? Wouldn't we be able to spot either that or pick up their communications by now if it had ever happened within a reasonable distance of us? I can think of no reason why advanced ETs would bother to try to shield us younger species, it just doesn't make sense, unless you're looking for a plot device for a long running TV series.

      The whole elder younger races thing, is even sillier, if there had been hundreds or thousands of apex species maybe we wouldn't know everything about all of them, but wouldn't it make sense that if there are multiple species in contact with each other eventually younger species will figure out the tech of the older ones, build on it and they will advance together? It seems unlikely to me that any species will have passed its prime keeping its technology secret, to the point that a younger race would be unable to reverse engineer it, so that the elder race is viewed as mystical.

      Finally, I think that far-flung colonies forgetting about technology and regressing is possibly the most plausible, doesn't it also stand to reason that if we are such a colony we know enough about our planet that we'd be able to detect and "advanced tech" from our distant past?

      I think the possibility that another poster mentioned, that we're just not in a sweet spot of galactic geography makes sense. If the c speed limit holds, any real colonization is likely to happen somewhat closer to the galactic center where interstellar distances are more manageable.

      OTOH if the c speed limit doesn't hold, then I agree with Fermi, we really should have seen some ET life by now.

    4. Re:There is nothing as unusual... by Orange+Crush · · Score: 3, Insightful

      You are assuming we would recognize any evidence of extra terrestrials as such. If advanced ETs exist, we do not know by what means they communicate, travel, their preferred habitats, what resources are of value to them and can only guess what indicators we should look for. If there was an exact duplicate of the present-day Earth with humans and all a mere 3 LY away we'd still have a difficult time finding each other. We give off stronger radio emissions than our star ought to, but it's hard to make sense of any of those signals at such a distance--Arecibo probably isn't sensitive enough to pick out omnidirectional TV and radio signals and with more and more of our communications going digital or over wires, we're getting quieter. We'd probably have to send a powerful, focused and deliberate signal when our counterparts are actually listening to our part of the sky to get noticed. Maybe a space telescope could catch the earth transiting the sun clearly enough to pick out the emission lines of free Oxygen in our atmosphere--a strong indicator of life, but even that's exceedingly difficult and no guarantee. Basically, we're pretty deaf & blind and have little clue what we're supposed to be looking for anyway.

      Our galaxy might be teeming with life, it may have even attempted to communicate with us many many times, but with our present ability to observe the universe around us, we very likely wouldn't have noticed.

    5. Re:There is nothing as unusual... by PastaLover · · Score: 2, Insightful

      If there is extra terrestrial life capable of FTL travel, wouldn't it stand to reason that it would put out colonies? No, it would not. How would you know what they'd want to do with this ability? Personally I find it very likely that at some point in the future human beings discover FTL travel, discover a few habitable planets, colonize them and then come up to a point that they just don't care to bother with it any more.

      If we were able to evolve our economical structures to a point where we'd have cured world hunger/disease/etc. and stabilized the population due to some tricky social structures balancing, we might no longer feel the need to colonize more worlds due to lack of population pressure. Personally I think it is more unreasonable to expect an intelligent race to attempt to colonize the entire galaxy. To what end? Once you are intelligent enough to invent FTL travel, do you really still feel the need to satisfy this old biological imperative?
  21. A factor of time... by dpilot · · Score: 2, Interesting

    We're all made partially of stars. As for original matter, there was mostly hydrogen, a little deuterium, less helium, and negligible (maybe none) amounts of the rest. For that matter, the early universe was too hot to even allow atoms or nuclei to exist, let alone heavy elements.

    All of this stuff in us, excluding the H in our H2O, came out of stars. It took several generations of stars being born and dying to get to the raw materials out there for us. I once read, though I can't quote where, that we are relatively early onto the scene, as far as this galaxy goes. Relatively may be a fuzzy term, but I would interpret it to mean that there won't be intelligent life billions of years older than us.

    Just like there's a roughly defined habitable zone around the sun, there's also likely a habitable zone in the galaxy. Too far in and the radiation is too great, too far out and there haven't been enough stellar generations, enough scattering of heavy material, to produce complex life.

    IMHO, the Drake Equation is optimistic, and doesn't properly address time.

    --
    The living have better things to do than to continue hating the dead.
  22. Extension of Murfy's Law: by Anonymous Coward · · Score: 4, Insightful

    Here is why we do not see alien colonizers: Any civilization sufficiently advanced to discover Space Travel evolves its own GW Bush.

  23. Let's find out. by DG · · Score: 4, Funny

    Slashdot Low User ID Operations Order 001

    1. SITUATION: the Fermi Paradox compels us to populate the Galaxy or become extinct.

    2. MISSION: NASA will design, test, build, staff, and deploy a fleet of interstellar colony ships for the purposes of populating the galaxy.

    3. EXECUTION: This mission will take place in 6 phases:

    a. Design a colony ship;

    b. Test the colony ship;

    c. Build a fleet of colony ships;

    d. Staff and populate the colony ships with suitable colonists;

    e. Deploy the fleet; and

    f. Monitor the colonies and provide support as appropriate.

    4. SERVICE SUPPORT

    a. Funding: no change.

    5. COMMAND AND SIGNALS: no change.

    There! Let's see if that works.

    DG

    --
    Want to learn about race cars? Read my Book
  24. The Fermi growth assumes uncontrolled growth by vidarh · · Score: 4, Interesting
    As we can ALREADY see, some mechanism is at least in humans reducing population growth in the parts of the population that have reached a certain level of social safety: Most developed nations are seeing sub-replacement level birth rates. In countries who have not yet reached this stage, we are seeing mass deaths and low life expectancies. And it's worth noting that this is not cultural either - immigrants moving to developed countries typically adapt to the host nations birth rate patterns within 1-3 generations.

    So a simple possible answer to the Fermi paradox is that this is an inherent biological mechanism and that in any population that grows to fill its biological niche, birth rates will sooner or later drop until an equilibrium is reached, and this is likely to happen before there is significant pressure to colonize the nearby solar system or stars. While that would leave visits to other planets still reasonably likely, and perhaps even small "local" colonies, without an expanding population and diminishing resources driving prices up, pure economics would dramatically slow down the tempo of any colonization effort to what private individuals could afford and would want to try.

    Look at how long Europeans had the capability to reach America before the wave of colonization started, for example. This was a set of cultures that were aggressive and expansionist. Assume the drive to start colonization gets successively less likely as the cost of doing so goes up and the immediate benefit of doing so drops. Once it takes more than a lifetime for economic value to be derived from a colony due to travel time even at light speed, the motivation for pushing for it dramatically reduces for most individuals (look at how hard it is getting people to even sacrifice spending today vs. getting a good pension until they're getting to a certain age, not to consider getting people to sacrifice now for the benefit of their children).

    Even with dramatic population growth, a colony would either have to bring economic value (in the form of resources) OR cost little enough in terms of resources to initiate and transfer colonists to than leaving the people the colony would have been made up of in place for a long enough amount of time to make giving up those resources seem prudent. If improvements in how we exploit various resources keep improving, that in itself might put a significant damper on any colonization efforts.

    That leaves us with possibly the odd colony here and there or the odd probe. Small colonies would face high odds of dying off, and would be unlikely to be established far away - presumably nearby stars would be targeted. Unless these colonies then enter an aggressive expansionist phase, and either had the technology to pull it off (provide resources for itself) or had the fortune of finding a location that provides abundant resources, it would take a lot of time before such a colony could produce offshoots further away. Chances are they'd grow to fill their new solar system first, and run into the same hypothetical growth reductions as we're currently seeing with developed countries on earth.

    That leaves radio. Why haven't we heard radio chatter? Stephen Baxter suggested a simple solution in the novel "Space": IF there are aliens out there, we might not want to make a big fuss about our existence, and also, a civilization may simply grow past broadcasting (That book does also, btw. pose an alternative explanation for the Fermi paradox, but stating it here would be a huge spoiler - it's a good read). We might already be nearing the time where we'll "go silent", as technological advance continues. Given the number of possible stars, how short time we've been listening, and how short periods potential civilizations may broadcast, it's very possible that there just aren't enough civilizations at the right stage of development that their radio chatter happened to intersect with the time periods we are currently monitoring. We may for that

  25. Simulation and Imagination Argument by quokkapox · · Score: 3, Interesting

    I think the answer to the Fermi paradox is this:

    Once a civilization has derived the laws of physics and chemistry to sufficient precision and certainty, there is no longer any pressing need to pursue direct observation of extraterrestrial intelligence. You can simply assume that it exists, based on your local knowledge.

    We are reaching this same point with our knowledge of biology; everywhere we look on Earth, we find life. Simply confirming the existence of microbial life on Mars would make it a bit less urgent to get all the way to Europa and verify that it's there too. If we did make it to Europa to confirm that life has evolved there as well, I'd be reasonably comfortable making the prediction that life exists pretty much everywhere else in the galaxy.

    If there's no reason to doubt life elsewhere in the galaxy, there's probably intelligent life too. So why worry about going there and confirming something by direct observation, when there's a 99.999% probability that it's true? It makes more sense to stick around here for now and simulate what they're like instead of going there and seeing it directly.

    Once we have learned how to just simulate the biochemistry of Europa with high enough fidelity, there's no longer any pressing need to go there, is there? If we make it that far and our simulations and models indicate the presence of life on extrasolar planets, that's good enough for me.

    In other words, the reason the aliens haven't bothered to travel here, land, and say "take me to your leader" is because they know what would happen already. It doesn't matter what we are actually like. It doesn't matter what they're actually like either, because we can imagine them now and we will be able to simulate them soon enough.

    The reason we don't run into aliens is because we can imagine and simulate them and they can imagine and simulate us and there's no point in actually confronting each other expensively IRL.

    --
    it's a blue bright blue Saturday hey hey
  26. Simple solution to this paradox by boyfaceddog · · Score: 3, Interesting

    1) A species capable of galactic colonization must be organized
    2) Organization requires competition. The better the competition, the better the organization
    3) Competition promotes conflict - either between species or within competing factions of a species
    4) As the ability to colonize space develops, so does the ability to destroy the whole species
    5) Since colonizing a new area is the essential goal of all species (survival requires species to spread as far as possible) reaching this "ultimate" goal will require overcoming the competition at all costs including destroying the original habitat and all members of the species.
    6) All species capable of colonizing space must enevitably destroy themselves.
    Colonization is not possible. Cooperation will NOT lead to galactic colonization as it will ony lead to cooperative use of existing resources.
    At least that's my two cents.

    --
    Here will be an old abusing of God's patience and the king's English.
  27. Re:Back to sailing ship days by DrCode · · Score: 2, Funny

    software developed in Estonia...

    Damn, why is this "cvs update" taking so long? Oh yeah, the project is hosted in Alpha Centauri.

  28. They're already here. . . by Fantastic+Lad · · Score: 2, Interesting
    What did Fermi say exactly?

    From wikipedia. . .

    The extreme age of the universe and its vast number of stars suggest that extraterrestrial life should be common. Considering this with colleagues over lunch in 1950, the physicist Enrico Fermi is said to have asked: "Where are they?" Fermi questioned why, if a multitude of advanced extraterrestrial civilizations exist in the Milky Way galaxy, evidence such as probes, spacecraft or radio transmissions has not been found. The simple question "Where are they?" (alternatively, "Where is everybody?") is possibly apocryphal, but Fermi is widely credited with simplifying and clarifying the problem of the probability of extraterrestrial life.

    Okay then. Many people have pointed out the numerous and embarrassing flaws in this logic, but I really don't think Fermi was being stupid or ignorant at the time he posited his question. It was the 50's, after all, and people trusted their government. People did not yet grasp how the world worked with regard to government secrecy and population thought control. From our stance today, we have a great deal of available insight into this; we know about Joseph Goebbels, we know that advertising is incredibly effective, we know that the strobe effect of Television puts the human brain into a highly suggestive state. We know that what you teach kids at a young age shapes them for life. And if we dig deeper, we know that the human brain is easily manipulated in far more disgusting ways; (Greebaum).

    It is easy to control people's beliefs. Churches have done it for centuries. For those who reject religious dogma, the media picks up the ball; ie, replace 'religion' with 'cult of science'. Real scientists don't care about embarrassment or being laughed at; they can't afford to because at some point every new and important idea posited by a scientist is going to be ridiculed and attacked by the layperson. So those who fear to talk about UFO's in an open manner, without any trace of fear or bias or mocking doubt in their tones, are not really scientists. They are just another brand of dogmatist.

    As I've said, it is easy to control people's beliefs, --and by extension, their perceived realities.

    So continuing Fermi's logic. . , If logic implies that the Milky Way is teeming with life, then perhaps it IS, and perhaps there is another reason we have not heard from that life.

    Consider: There are UFO's constantly buzzing our skies. We have seen hundreds and hundreds of crop circles. We have countless reports from people who claim abduction experiences.

    How can any rational person live in the same world as all of this and insist that there is no evidence? That's kind of strange. Crop circles are the perfect example; they are there in a manner which is available to anybody, (One recalls the old complaint of the sceptic, "I'll believe it when there is some evidence layed at my feet!"), they cannot be rationalized away; (the Ropes and Planks explanation falls hopelessly short when you get close enough to actually look at the details of the problem.) And yet, the world carries on as though nothing were happening.

    It reminds me of a Douglas Adams creation; a system of invisibility where rather than bend light, you bend minds. --So that people ignore like crazy that which is right in front of them.

    Aliens are already here, and they have been for centuries. The logic, if expanded to include this, might want to ask this little question...

    How much effort do humans make to communicate with the cattle they raise? (As above, so below.)

    Well, we've got the crop circle side of the equation. But we also have the abduction side. There are two different approaches to anyt

  29. Fermi Paradox is bullshit by Master+of+Transhuman · · Score: 2, Insightful

    Chimpanzees imagining what a higher intelligence would do.

    It's laughable.

    First of all, "civilization" is a meaningless term derived strictly from human behavior. It might be possible to imagine a collection of technologically advanced entities who do not exist in anything we would term a "civilization" or "society". In fact, I suspect truly advanced entities do not operate in "societies" at all, but are more like the fictional representation of "dragons" in fantasy literature - more or less independent entities who only interact with others of their kind for specific reasons.

    Second, "colonization" might be utterly irrelevant to an advanced intelligence for any number of reasons, especially reasons we haven't thought of based on the nature of that intelligence.

    Third, the concepts require the notion of biological reproduction. What about a sentient entity which is not based on biology? Such an entity has no need to reproduce. While it can and may reproduce, there is no evidence that it or any particular population of it would see any need to reproduce to the level of "colonization" or even "civilization" in the human sense.

    If my prediction is correct that a Transhuman requires nothing but energy, materials, nanomass, computing power and knowledgebases to exist, what need does a Transhuman have to reproduce or "colonize"?

    All the Fermi Paradox demonstrates is the lack of imagination on the part of so-called "scientists".

    --
    Richard Steven Hack - This sig is TOO GODDAMN SHORT TO DO ANYTHING USEFUL WITH! MORONS!