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Callisto is the second-largest moon of Jupiter and the third-largest moon in the Solar System.
Known for its heavily cratered surface, it is the most heavily cratered object in the Solar System.
This suggests a long history of impacts.
Key Facts
- Orbital Period: About 16.69 days
- Diameter: Approximately 4,820 km
- Surface: Characterized by a mix of ice and rock
- Average Distance from Jupiter: About 1,882,700 km
- Orbital Speed: Approximately 8.204 km/s
Surface and Composition
Callisto's surface is a mix of ice and rock, with a possible subsurface ocean beneath its icy crust. Its lack of an atmosphere and geological activity implies a very stable surface.
Interesting Facts
- Callisto is thought to have the lowest density of all the Galilean moons, indicating a high composition of water ice.
- Unlike other Galilean moons, Callisto does not experience significant tidal heating, which accounts for its lack of geological activity.
- Callisto is considered a prime candidate for future space missions due to its relatively low radiation levels compared to other Jovian moons.
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