Ganymede is a moon, yet it is larger than the planet Mercury, may contain more water than exists on Earth's surface, and even generates its own magnetic field, making it less like a conventional moon than a full-sized world that happens to orbit Jupiter. - Space Daily
Source:Space Daily
Jupiter’s largest moon is so vast and geologically complex that planetary scientists struggle to explain why it merely orbits rather than commands its own place in the Solar System.
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