Callisto
CategoryMoon of Jupiter
SystemSolar System
Diameter4821 km
Orbital Period16.7 days
About Callisto
The most heavily cratered object in the solar system. Surface has not changed significantly in 4 billion years. May have a subsurface ocean deep beneath the surface. The third largest moon in the solar system. Farthest from Jupiter of the four Galilean moons. Valhalla crater is a multi-ring impact structure 3,800 km across.
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