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Ganymede is a Natural satellite of Jupiter and is the largest moon in the Solar system, with a diameter of 3,273.5 miles. Ganymede is in a 1:2:4 orbital resonance with Europa and Io. It is also the only moon in the solar system with a substantial Magnetic field.

Discovery

The moon was discovered by Galileo when he pointed a telescope at Jupiter. Thus, Ganymede and the four other main moons of Jupiter are sometimes called the Galilean Moons.

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