At NASA they are afraid that microbes made it to Mars through both vacuum and extreme radiation and temperatures. So with a tiny atmosphere they could make a living of something (e.g. oxygen if they need this, if not, this is something they could evolve from). Of course the chance of life is with a very restricted evolution opportunity. Still surpriced of how those extreme microbes could survive in vacuum for such a long time. But taken into consideration that they might have succeded the travel they should have a chance on moons with tiny atmospheres.

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