Ganymede

Descrption:
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. It has a diameter of 5,268 km and is 8% larger than the planet Mercury, although only 45% as massive.

Radius: 2,634 km

Distance to Earth: 628.3 million km

Gravity: 1.428 m/s²

Surface area: 8.72×107 km2 (0.171 Earths)

Did you know: It was probably formed by an accretion in Jupiter's subnebula, a disk of gas and dust surrounding Jupiter after its formation.