Ganymede is the largest moon of Jupiter and the largest moon in the entire Solar System. It has a diameter of about 5,268 kilometers (3,273 miles), making it even larger than the planet Mercury. Ganymede is one of the four largest moons of Jupiter, known as the Galilean moons, which were discovered by Galileo Galilei in 1610. The other three Galilean moons are Io, Europa, and Callisto.
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