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How many moons does Jupiter have?

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80% Informative

Jupiter 's four largest moons are the Galilean moons, named Ganymede , Callisto , Io and Europa .

Each of Jupiter 's other 91 official moons has a diameter greater than 0.6 mile ( 1 kilometer ) But only 57 have names, and just eight have regular, nearly round orbits.

Saturn 's biggest moon by far is Titan , with almost twice the mass of Earth 's.