The largest moon in our solar system is Ganymede, which orbits Jupiter. It is 5268 km at its equator, making it larger than Pluto (2390 km) and Mercury (4878 km), and almost as large as Mars (6,800 km). It is mostly made up of silicate rocks and ice, with an iron-rich liquid core. It also may contain an ocean below its surface.
By comparison, our moon is the 5th largest, at 3475 km.
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