maybe that's the premise for F&F6?... lol
Well, Jupiter has 50 moons and 14 provisional moons but Ganymede is the largest moon in the entire solar system. It also is the moon scientists speculate is the most likely to be harboring an alien form of live beneath its 800km-thick, icy surface layer due to its metal core and rocky mantle, much like the earth's core and mantle. They also detected a layer of oxygen in its atmosphere back in 1996 but it is too thin to support any form of life.