Other issues for Jupiter's moons is the distance of the whole system system from the sun, their distance from Jupiter an of course the immense size of Jupiter its self

As I remember, Pandora had multiple moons in Avatar, actually I guess it was its planet primary and its moons.

Ebbie you might like part of this ad. Check out the background as the parachutists land.

USAF

Ebbie, In Science Fiction and Fantasy multiple suns are common too.

Nightfall, By Asimov is a classic.