Ganymede, a satellite of Jupiter, is the largest and most massive of the Solar System's moons. 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.

View on Maps: google.com/maps/space/ganymede

Radius: 1,636.8 mi

Orbital period: 172 hours

Gravity: 1.428 m/s²

Surface area: 8.72×10⁷ km² (0.171 Earths)

Did you know: Ganymede is larger than both Mercury and Pluto, and is 2/3 the size of Mars with a diameter of 5,268 km (3,273 miles) – 8% larger than Mercury.