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Ganymede
Ganymede
Description
Satellite of Jupiter
Orbital period 172 hours
Diameter: 5,268 km
Radius: 2,634 km
Discovered January 7, 1610
Discoverer(s) Galileo Galilei

Ganymede is the largest and most massive moon of Jupiter and in the Solar System. The ninth largest object in the Solar System, it is the largest without a substantial atmosphere.