Ganymede: Meet the Largest Moon in Our Solar System, Jupiter's Water World

Updated 12.7.15, 11:35 AM EST by Jolene Creighton

Ganymede is so large that, if it orbited the Sun instead of Jupiter, it would be considered a planet. But it isn't just the largest moon in our solar system, it also has an ocean - an ocean that contains more water than Earth.

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