Quote:
Originally Posted by scc
This is about size of moons in relation to the planets they orbit.
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Ah, okay. In that case ...
The maximum total mass of the gas giant's satellites should be no more than 2% of the gas giant's mass. (Warning! This'll produce some freakishly big moons, but, well, Luna
is a freakishly big moon.) Or did you want maximum diameter? If so, physics seems to suggest that 80k miles diameter is about the top end for gas giants with any excess mass going to increase density rather than further increasing volume.