Ganymede is the largest moon in the solar system, and it’s even larger than the planet Mercury—meaning it’d be a planet if it were orbiting the Sun instead of Jupiter. It has its own magnetic field as well, something that no other moon can claim.
It also has a thin oxygen atmosphere, but it’s nowhere near thick enough to support life. Ganymede’s craters are very flat when compared to most moons, which suggests geologic activity below the surface—not surprising for something so large and so close to Jupiter.
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