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H2O Formation

  1. Sep 28, 2009 #1
    Can H2O form with out an atmosphere?
  2. jcsd
  3. Sep 28, 2009 #2


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    Staff: Mentor

    Define "form", define "without an atmosphere" - while it may seem obvious to you what you mean, question is very ambiguous.

    Last edited: Sep 29, 2009
  4. Sep 28, 2009 #3


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    Science Advisor

    Well, there's a lot of interstellar water, most of which probably formed out there in space (novae? supernovae?) That's the likely source for much of the early water on Earth: ice comets raining down upon earth (as opposed to stuff 'outgassing' out of the Earth's core). Unfortunately, I can't find a good source for this last assertion, beyond what I remember and the Wikipedia article:
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