💬 Reply by TerryHancock

@futurebird

I remember diving into this when I was young, for SF reasons.

It's a bit tricky because the ability to retain an atmosphere is actually a function of escape velocity, not surface gravity.

And they're not proportional. I think (escape velocity)/(surface gravity) goes as radius? IIRC.

So your mini-Earth probably needs even higher gravity (possible if it's mostly iron) in order to meet the escape velocity requirement.

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