Ganymede and Callisto have densities suggesting they are made of rocky cores and mantles of

Name: Ganymede and Callisto have densities suggesting they are made of rocky cores and mantles of
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Ganymede and Callisto, moons of Jupiter, have densities lower than that of Earth but higher than that of pure ice, suggesting they have rocky cores and are surrounded by substantial amounts of water or ice, rather than being made primarily of ammonia ice, hydrogen, liquid methane, or iron.

Ganymede and Callisto Have Densities Suggesting They Are Made of Rocky