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Dusty Disc May Mean Other Earths
DoraLives writes "According to the BBC, astronomers say they have evidence for Earth-like planets orbiting a nearby star. The star in question is Vega, which is nice and close (as stars go), quite young (also as stars go), and one of the brightest stars in the sky. Apparently, 'Vega has a disc of dust circling it, and at least one large planet which could sweep debris aside allowing smaller worlds like Earth to exist.' Should be interesting to keep an eye on it as the years roll by as the disk rotates and our optical powers keep growing."
If it does have an Earth-type planet, it'll probably be inhabited by a bunch of beings that look like my late father... that's barely worth the trip out there, or an hour and half.
I'm tired of bombing the universe
Then the arms race starts.
"Have you ever thought about just turning off the TV, sitting down with your kids, and hitting them?"
She's the Expert on going to Vega....
Vegans really ARE aliens from another solar system!
I'm off to eat some meat.
I claim first use of "Error No. 0B" - or "No. 0B error." It'll be the new ID 10T!
Vega is only 25 light years away, so they'd be looking at the 70's. Of course, once they hear Disco, they'll probably decide nothing of value could have ever come from our system.
It should be illegal to say that freedom of speech should be limited.
The likelihood of other meaningful life in the Universe just got better. And I for one welcome the possibility.
Try not. Do or do not, there is no try.
-- Dr. Spock, stardate 2822-3.
Here are Terrestrial Planet Finder links at:
I kind of doubt anyone there is looking at us right now. From the (somewhat fuzzy) description in the article, it sounds like what we're observing is a disc of dust surrounding Vega with proto-planets forming within it. It was probably several hundred million years after the Solar System passed through that phase before life even got started on Earth. According to currently accepted models of planetary formation, those proto-planets would be pretty hellish places right now; their surfaces will be blazing hot and suffering constant bombardment by other, slightly smaller bodies. Being anywhere on the surface of one would be like being at Ground Zero of a massive nuclear strike.
The correlation between ignorance of statistics and using "correlation is not causation" as an argument is close to 1.
Apparently everybody is thinking of earth-like planets and stuff. Sorry, but NO.
1 - Vega is 25 light-years away. That's around the corner and "today" in astronomical terms
2 - Carl Sagan picked Vega not because of planets, but because there were none, just a bunch of dust... There was a RELAY there, not aliens...
3 - The news actually said about process that could happen; a balance between a dusty ring and an outer planet...
how long until
I am SO depressed that all the /. crowd can come up with are lame Contact references.
YOU CALL YOURSELVES GEEKS! DROP AND GIVE ME TWENTY!
Vega, as ALL REAL GEEKS know, was the home of Mother Thing of Robert Heinlein's "Have Space Suit, Will Travel".
And if they are watching Earth circa 1978, we'd better be damn thankful they don't rotate us 90 degrees just on general principles!
www.eFax.com are spammers
The article suggests that Vega is only 350 million years old. Moreover, at about 3 times the mass of the Sun, the lifespan of Vega will only be about 1 billion years. Given that it took about 3.5 billion years for life to get going, it seems unlikely that planets around Vega have (or ever could have) interesting lifeforms, even if an Earth-like planet is present.
Two wrongs don't make a right, but three lefts do.
-Since the Vega system is very young, any terrestrial planets will probably not yet be in a "finished" state, but will still be busy accreting smaller planetesimals- for the Earth, this initial process might have taken 30 million years. Also, any such planets will not have finished differentiating into a core, a mantle and a crust.
If you send a probe there, it will not be able to find a cool surface on any of the larger planetesimals (growing proto-planets).
The Vega system is interesting because it provides a snapshot of the early phase of planet formation.
If you want to make a "Star Trek" style tour of a system, landing on the planets and checking for the presence of life, you need to find a more "mature" system, where the planetary crusts have had time to cool off, and where most of the orbiting debris has alredy been swept up by planets.
One other interesting point about the Vega system though: It is bound to have an amazing number of large, highly visible comets ! In mature systems, most comets have either been kicked out to the Oort cloud or crashed into a planet.
Yours Birger Johansson Sweden
By Earthlike I believe they mean terrestrial; a rocky world, as opposed to a gas giant.
Other known terrestrial worlds include baked-out Mercury, greenhouse-wracked Venus, and dry, cold Mars. Most people would not consider these "Earthlike" in the Star Trek Class M sense of the word.
That said: Even given the existence of terrestrial planets, Vega isn't a great place to go looking for a habitable, life-bearing world. It's a bright, hot star, which also means that it is a short-lived star. In a few hundred million years, when its potential planets begin to cool to the point where water would condense, Vega would be getting ready to wander off the main sequence and get way unpleasant to be near.
Another strike against life developing on Vega worlds: a greater percentage of its energy output would be in "bluer" wavelengths, including UV. Once it got started, life might adapt to UV, but to get started in the first place it needs some stability. I can see a influx of UV ripping apart delicate chemical chains in Vega Prime's oceans, greatly reducing the chance that life would get a foothold.
All this said, this is hopeful news, because the existence of one planet-forming debris field means there are probably others . . . some around more genial F and G and K class stars.
Stefan
First, there was plenty of life in 5000 BC. In fact, there was plenty of life in 1000000000 BC.
Second, Vega is only 25 lightyears away, meaning that the horrid bug-eyed Vegans are peering through their observoscopes and lusting after Farrah Fawcett.
When all you have is a hammer, everything looks like a skull.
"the mods probably don't remember that Dune was a satellite of Vega"
Slashdot Rule 1: Don't assume that the mods remember anything
No, Rule number one is we don't talk about moderation club outside of moderation club
the horrid bug-eyed Vegans ...and that's why meat and dairy are important parts of a well balanced diet.
=Smidge=