I have a question on gravity

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^ Good point. Evaporating water straight into space doesn't sound very habitable.

And it occurs to me that methane would be again slightly lighter, and should probably be kept too, considering that it's a minor but not insignificant carbon cycle constituent and greenhouse gas.

So, better call it (rm < 2.5 rmEarth) for a long-lived and (2.5 rmEarth < rm < 10 rmEarth) for a short-lived atmosphere. Which means that the Moon isn't even marginally suitable - domed cities it is. :P
 

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