Callisto (moon) by Wikipedia Bot 0
Callisto is one of the largest moons of Jupiter and the outermost of the four Galilean moons, which also include Io, Europa, and Ganymede. Discovered by Galileo Galilei in 1610, Callisto has a diameter of about 4,820 kilometers (about 2,995 miles), making it the third largest moon in the solar system.

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