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Moon Could Have Been Habitable Once, Scientists Speculate (gizmodo.com)

Scientists from Birkbeck, University of London speculate that recent results show that the moon is wetter than scientists have previously thought, increasing the possibility for it to have the necessary conditions for life. "Whether life ever arose on the Moon, or was transported to it from elsewhere, is of course highly speculative and can only be addressed by an aggressive future program of lunar exploration," they write in the article, published in the journal Astrobiology. Gizmodo summarizes: This habitability period, if it really occurred, might have happened either just after the Moon's formation from a massive collision with Earth 4.5 billion years ago, or 3.5 billion years ago, after a period of volcanism which may have resulted in a thin lunar atmosphere. Such an atmosphere would have lasted perhaps tens of millions of years. Maybe water existed on the Moon at this point. Maybe 10 million years was enough time for some rudimentary life to evolve on the Moon. Maybe Earthly life traveled over to the Moon on asteroids. Who knows.

The researchers stress that "habitability requires much more than just the presence of a significant atmosphere and liquid water." One such requirement would be the presence of organic compounds. And there are obviously not the same water-created features on the Moon that we see here on Earth or on Mars, like drainage channels -- though maybe these existed and were eroded by small meteors and solar winds. While the paper doesn't present new data, it's an interesting synthesis of lots of existing research demonstrating that, since the Moon is wetter than was initially thought, maybe it's worth wondering whether it was once habitable.

7 of 87 comments (clear)

  1. Slashdot today by andrewbaldwin · · Score: 4, Insightful

    An interesting topic and relevnt for science and nerdy types -- yet the first 15 or so comments are all off topic, snide remarks and the inevitable (and tiresome) ad hominem attacks.

    Not a single reply which bore any relevance to the topic.

    Come on Slashdot, you are better than this !!

    1. Re:Slashdot today by sheramil · · Score: 2

      Come on Slashdot, you are better than this !!

      It really isn't, any more. As long as they let anonymous cowards pee on the fire hydrant, we'll get the above responses. The people who are fuming about the preponderance of "may", "maybe" and "might"s in the original article have to take a back seat to the 9gag crowd.

      Personally, I don't think a body the size of the moon could ever have held on to an atmosphere long enough for life to develop. "Ah, yes, BUT!" the journal of Astrobiology retorts, "there might have been extremophiles lurking in some of the damper cracks, before the atmosphere faded away completely and the hard radiation reached them and baked them."

      That's nice, dear. We have an entire universe mostly populated by bacteria. And us.

    2. Re:Slashdot today by Anonymous Coward · · Score: 2, Insightful

      The article claims the Moon held an atmosphere for 10 million years. However, I work in the field of planetary chemistry and this this entire concept is pure speculation. I can't really believe that it's been published, but I'm not familiar with the journal Astrobiology. It might be dog shit. The impact factor is 3.6, so middling but probably worth a read.

      The main issue with the hypothesis is that it depends on how the moon formed, which we don't know. If it occurred by impact then while the formation process itself can happen relatively rapidly (100k to 1m years) but looking at the whole process:

      Giant impact by Theia;
      Coalescence of the Moon from ejecta and debris;
      Cooling of the Moon to form a crust;
      Cooling of the Moon to allow an atmosphere;
      Cooling of the Moon to allow water on the surface;
      Formation of life;
      Loss of atmosphere, end of life.

      It's pretty damn clear to me that there is no way that could have happened within 10 million years, especially since we don't have any idea how much time is required to form life.

      If bacteria is ubiquitous across the solar system then yes, one can presume that it would seed any suitable world as soon as it can get there. But if that's the case then were is all the bacteria? We should be finding it on Mars, Titan, Europa, within the fragments of failed planets that come to Earth as meteorites. All we have to do is find one single bacterium elsewhere in the solar system and our entire impression of life and its origin changes dramatically.

      My take on Drake has always been: life is either nowhere else but here, or it's bloody everywhere; with no middle ground.

    3. Re:Slashdot today by nucrash · · Score: 2

      Those sound like two very odd extremes.

      Presently we have a sample size of one. We have some samples from locations that give us information that life presently is not likely in locations such as Mars, Venus, or any of the other major planetary bodies. We presently know that we have two very large planets with moons that look like there might be a hint of possibility that they could have life. Even if they do, we can't say much without proper research.

      This is an early working theory. Ten million years is a very slim window. Considering the rate at which bacteria developed on Earth, we are talking about a very limited window. At which case, if we did actually find traces of life on the Moon, that would lead credence to the Panspermia Theory. If we don't find evidence of life then we have four other potential locations that I know of in our own solar system to look for that life. Yet, I can't help but think that we really didn't know about extremophiles until less than forty years ago. The idea of life existing in acidic or basic environments is still relatively new. They weren't even in the taxonomy chart when I graduated school in the nineties.

      This does give us a solid reason to return men to the Moon for a potential endurance run rather than the short term stints we had in the sixties and seventies. I just hope the United States takes this opportunity instead of deciding to walkaway from the manned space program.

      --
      Place something witty here
    4. Re:Slashdot today by Oswald+McWeany · · Score: 2

      Dude, even simple bacterial would suggest that abiogenesis happened twice in this solar system. This will excite Drake very much.

      If there is life on the moon- or ever was, it would be much more likely to originate from Earth.

      --
      "That's the way to do it" - Punch
  2. Having the elments to support life != having life. by jellomizer · · Score: 3, Insightful

    In the Scientific Process this is on step one hypothesis. Which is just a logical guess. This phase is no better then philosophy, where it is just logical thinking of things.
    I don't call this science, or these people scientists because science hasn't been done yet.
    That rant out of the way.
    I am going to give my hypothesis/philosophy to approaching that idea.

    Life isn't just about having the elements, they need to be arranged in the right way. While the moon has a lot of water, I don't think it is distributed well enough to have the conditions to start life.

    We as humans can go there, we can probably mine the water and other life giving chemicals from the moon, but at great effort. Even the effort to scrape enough material to keep a bacteria alive, would be considerable effort. More then the random chance.

    --
    If something is so important that you feel the need to post it on the internet... It probably isn't that important.
  3. by default? by sad_ · · Score: 2

    can't we assume that every planet (except, perhaps gass planets) and/or moon was capable at a certain point in it's life to support life?
    as the planet/moon ages it loses these capabilities and ends up a dead rock, remember earth will be inhabitable at a certain point as well.

    --
    On a long enough timeline, the survival rate for everyone drops to zero.