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Pluto (dwarf planet)

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Pluto, officially designated 134340 Pluto is a dwarf planet in our Solar System. It was called the ninth planet until 2006, when scientists decided that it was too small to be a planet.

Pluto was originally discovered in 1930, and then in 1978, its moon, Charon, was discovered. Now, we know it has four other moons beside Charon: Hydra and Nix were found in 2005, and two more moons, Kerberos and Styx were found in 2012. All the moons are named after characters from Greek mythology.