- Ganymede:
- Diameter: 5,268 km (3,273 miles)
- Orbit:
- Average Distance from Jupiter: 1,070,000 km (664,000 miles)
- Orbital Period: 7.2 days
- Composition: Ice and rock with a possible subsurface ocean.
- Surface Features: The largest moon in the Solar System, with a magnetic field and a surface of mixed rocky and icy terrain.