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Jupiter's Four Largest Moons
Pictures: NASA/JPL/Caltech |

Jupiter's Four Largest Moons
Shown in this composite image are Jupiter's four largest moons, known as the Galilean satellites. From left to right are Ganymede, Callisto, Io and Europa. The Galilean satellites were first identified by the Italian astronomer Galileo Galilei in 1610.


Pictures: NASA/JPL/Caltech |

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