06-17-2019, 05:12 AM
Would these atmospheric conditions necessarily remain stable on a biospheric world? Earth's toxic-gas period covered most of our planet's existence, but when photosynthesis came along, it changed our entire atmosphere, purged out most of the toxins (from our POV) and allowed life to adapt to free oxygen and develop complexity.
Couldn't an exoplanet be capable of the same process?
Couldn't an exoplanet be capable of the same process?