Jupiter's moons vary in size and structure. Callisto has large craters, Europa has cracks which may have contained water and Io has large volcanoes. Learn more about Jupiter's moons on the Learning... (more info)
Jupiter's moons vary in size and structure. Callisto has large craters, Europa has cracks which may have contained water and Io has large volcanoes. Learn more about Jupiter's moons on the Learning Channel's "Solar Empire."
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