Could a moon or planet exist with "puddles" of breathable air in deep craters?
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Could a moon or planet with otherwise no atmosphere maintain gas pockets in sufficiently deep craters, and could it be habitable by humans without pressure or space suits?
I found this similar question Would oxygen pool in sink holes if the upper atmosphere was helium, hydrogen and methane? but it focusses on a planet with a full atmosphere, I want to know if it would be realistic for a planet without enough gas to maintain a breathable atmosphere beyond depressions to exist.
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