Quote:
Originally Posted by Crystalline_Entity
If you designed a gas giant with Earth-sized moons, I don't think anyone could claim it was unphysical given what we know at the moment (it might be improbable that they'd all have Earth-like environments without artificial intervention though).
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I'm assuming that panspermia is in effect, or rather something like it. Life begin on one of the moons (The one that humanity evolved on) and was then spread to the others by meter impacts ejecting rocks contain life.
Quote:
Originally Posted by Sunrunners_Fire
GURPS Space ( pages 84 ~ 87) should have the information you are looking for.
If you want something more precise than that, I would suggest looking into the factors involved in determining a world's molecular weight retained; this appears to be a relatively simple starting point if you wanted to go down that rabbit hole.
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This is about size of moons in relation to the planets they orbit.