.@kchangnyt My money's on Martian marsh gas. Pockets of water with microbial life. I'd want to know if there's for a seasonal correlation in the increased levels. MT Something on Mars Is Producing Gas Usually Made by Living Things on Earthhttps://nyti.ms/2FH95J5
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Could also be pockets of water at high temperature and pressure combined with carbon-containing rock which doesn’t need to have a biological origin. I’d bet 50/50.
Yes, article says non-biological hydrothermal reactions is a plausible explanation. But that too would be fascinating and be exactly an environment where life thrives on Earth.
