Moon
Callisto
Galilean moon of Jupiter
The most cratered surface known
Callisto's ancient, dark surface is saturated with impact craters, recording billions of years of bombardment with little geological change.
Key facts
Distance
1,882,700 km from Jupiter
Diameter
4,821 km
Orbital period
16.7 days
Discovered
1610, Galileo
Orbits
Jupiter
Did you know
- It is the third-largest moon in the solar system.
- Valhalla, its largest impact basin, spans about 3,800 km.
- It may also host a subsurface ocean.
