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Moons – also called planetary satellites – come in many shapes, sizes and types. They are generally solid bodies, and few have atmospheres. Most planetary moons probably formed out the discs of gas and dust circulating around the planets in the early solar system. Moons orbit planets, and dwarf planets. They also orbit asteroids.

As of March 25, 2025, there were more than 891 confirmed moons in our solar system: