Active stars like Proxima Centauri may produce false positives for exoplanet biosignatures. Life not needed to produce atmospheric O2 & O3.
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Replying to @NASAWebb
give one example of something other theb life that create enormous amount of atmospheric O2 ?
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Replying to @MatteMatte31
Catalytic cycles on water-depleted M dwarf terrestrial planets: https://arxiv.org/abs/1501.06876
1:23 PM - 25 Aug 2016
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