Can H2O Form Without an Atmosphere?

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The discussion centers on the formation of H2O (water) in the context of atmospheric presence. It highlights that interstellar water likely forms in space, possibly through processes like nova or supernova events. This interstellar water is considered a significant source of Earth's early water, primarily delivered by ice comets rather than originating from outgassing from the Earth's core. The ambiguity in defining "form" and "without an atmosphere" is acknowledged, emphasizing the need for clarity in these terms to understand the processes involved in water formation.
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Can H2O form without an atmosphere?
 
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Define "form", define "without an atmosphere" - while it may seem obvious to you what you mean, question is very ambiguous.

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Last edited:
Herkeybird said:
Can H2O form without an atmosphere?

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:
http://en.wikipedia.org/wiki/History_of_the_Earth#Origin_of_the_oceans_and_atmosphere
 

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