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https://www.space.com/amp/mars-atmosphere-green-glow-exomars-tgo.html A green glow was seen in the Martian atmosphere by scientists. As far as I know, that is characteristic of oxygen, which would support the possibility of life on Mars. Cf. Aurora Borealis on Earth. https://www.bbc.com/news/amp/science-environment-53057055 https://futurism.com/green-glow-mars https://www.extremetech.com/extreme/311768-astronomers-detect-eerie-green-glow-on-mars-for-the-first-time