Smarty Pants Quiz
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Ganymede, Io, Europa, and Callisto are called the...
Galilean Moons
Hawking Satellites
Mendel Mysteries
Planck Planetoids
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Galileo Galilei discovered and named these four moons orbiting Jupiter in 1610.
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09
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Ganymede, Io, Europa, and Callisto are called the...
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