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Callisto

Moon of Jupiter

The outermost of the four Galilean Moons of Jupiter circles its parent planet at a distance of a little under two million kilometres, making it nearly twice as distant from Jupiter as any of its three bright companion moons, Ganymede, Europa and Io. It has a dark surface speckled with bright craters, often surrounded by rings of material. Its largest surface feature is a wide circular region about 600 kilometres in diameter, Valhalla, which is surrounded by circular patterns extending outward across Callisto's surface.

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