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A comment on Rosetta finds comet's water vapour to be significantly different from Earth's. Parent comment

Re:Rosetta finds comet's water vapour to be significantly di... by efuquen on Wednesday December 10, 2014 @07:01PM (#8732469)
Was digging around and found some good info, looks like tomr already answered the Nitrogen part of the question, which is the same info I found.

As far as methane, it seems to all mostly be biogenic[1].

[1] - http://www.astrobio.net/news-exclusive/methane-on-earth/

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