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Today in Astronomy

6 Jan 2009, 15:40 UTC
Today in Astronomy
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NASA/JPL/DLRJanuary 7, 1610Galileo Galilei observes the four largest moons of Jupiter for the first time. He named them and in turn the four are called the Galilean moons. Jupiter's 4 Galilean moons, in a composite image comparing their sizes and the size of Jupiter (Great Red Spot visible). From the top, they are Io,Europa, Ganymede and Callisto

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