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The largest planet in the solar system. More than 1,300 planets the size of Earth could fit inside Jupiter. Jupiter is the fifth planet from the sun, about 483 million miles (778 million kilometers) away. It takes Jupiter nearly 12 years to go once around the sun. Jupiter has a family of at least 63 moons and influences the orbits of more than 50 comets. The four largest of Jupiter’s moons, Io, Europa, Ganymede and Callisto, are called the Galilean moons because they are the ones that Galileo first saw through a small telescope 400 years ago.