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Who discovered jupiter's moons?

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The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto. They were first seen by Galileo Galilei in January 1610, and recognized by him as satellites of Jupiter in March 1610. They are the first objects found to orbit another planet. read more

Since 2003, 18 additional moons have been discovered but not yet named, bringing the total number of known moons of Jupiter to 69. As of 2017, this is the most of any planet in the Solar System; but additional undiscovered, tiny moons likely exist. read more

In January 1610, Italian astronomer Galileo Galilei discovered four of Jupiter’s moons — now called Io, Europa, Ganymede, and Callisto. He originally referred to the individual moons numerically as I, II, III, and IV. read more

Combined, scientists now think Jupiter has 69 moons. There are many interesting moons orbiting the planet, but the ones of most scientific interest are the first four moons discovered beyond Earth—the Galilean satellites. read more

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