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cryptonector
on April 16, 2020
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Could the Earth be an evaporated gas giant planet?
Venus has no plain oxygen because oxygen is reactive. It probably requires life to break apart CO2 and cast off the O2 into the atmosphere. Certainly it required life to do that on Earth.
three_seagrass
on April 16, 2020
[–]
Pretty much. Earth's reducing, oxygenating atmosphere is an anomaly that did not exist before stromataliths.
https://en.wikipedia.org/wiki/Stromatolite#cite_ref-PiP_15-1
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