The four largest moons of Jupiter. In order of increasing distance from the primary, they are Io, Europa, Ganymede, and Callisto. They were discovered independently by Galileo Galilei and Simon Marius in 1610. Galileo proposed that they be named the Medicean stars, in honor of his patron Cosimo II d...
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The four large satellites of Jupiter so named because Galileo discovered them when he turned his telescope toward Jupiter: Io, Europa, Ganymede, and Callisto.
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