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Unknowns comments on New Year's Predictions Thread - Less Wrong
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There could be an oxygen atmosphere without life for a short period of a planet's history (I'm not sure how long.) It wouldn't be possible for it to remain permanently.
According to our evidence, Mars had liquid water for a very long period, but no one considers this to be proof that there was life there.
I went to check this - maybe liquid water is a short-term enough thing that its mere presence is still weak evidence for an active biosphere, but apparently one timeline puts liquid water as present in large quantities for >600 million years. Bleh.