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A natural satellite belonging to gas giant Jupiter.

To date, 67 Jovian moons have been discovered, the largest being the 4 Galilean moons, Ganymede, Callisto, Io and Europa.

Galilean Satellites. From left to right, in order of increasing distance from Jupiter: Io, Europa, Ganymede, Callisto (credit:- NASA/JPL/DLR)

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