A moon is a natural satellite that orbits a planet. They are attracted to their planets by gravity; generally a larger or more dense celestial body will have stronger gravity. So, there are no moons larger than their planets, although there are moons larger than other planets. Jupiter’s moon Ganymede is larger than both Pluto and Mercury.
By definition, a planet has to clear out the space around its orbit — essentially, it has to turn surrounding objects into moons. It would be impossible, therefore, for a moon to be larger than a planet — then it wouldn’t be a planet at all. For example. Pluto has a moon practically its size, which is one of the reasons it is no longer considered a planet.
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