Astronomer Galileo Galilei, armed with a…

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Thursday, January 7, 1610: Astronomer Galileo Galilei, armed with a primitive telescope, saw three “stars” near Jupiter. About a week later a fourth one appeared. Galileo had discovered the four largest moons of Jupiter. Today the moons are called Io, Europa, Ganymede, and Callisto; they are known as the Galilean Satellites