Callisto is the second biggest moon of Jupiter, and the fourth in distance to it of the Galilean Moons. It is the biggest object known to not been fully differentiated, which means that the entire body never melt enought for make a complete differenciation between ice and rock, unlike the other Galilean Moons. Because of that, Callisto has one of the oldest and more cratered surface of the Solar System, almost satured of impacts. One of the most recognizable features is the multi-ring impact structure named Valhala.
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