The planet Pluto has three moons: Charon, Hydra & Nix. Charon, Pluto's largest moon, also known as Pluto I, was discovered by James Christy in 1978. Hydra and Nix were discovered in 2005 by the Hubble Space Telescope. Nix, Also known as Pluto II, was first observed by Max Mutcher on June 15, 2005, in images taken between May 15-18, 2005. Hydra, also known as Pluto III, was also discover from the same Hubble images by the "Pluto Companion Search Team".
| Charon | In Greek Mythology, Pluto was the god of the dead and Charon was the ferryman who ferried the souls to the underworld. |
| Hydra | In Greek Mythology, Hydra was a multi-headed dragon that guarded Pluto's underworld. |
| Nix | In Greek Mythology, Nix was the goddess of darkness and night and mother to Charon, the ferryman of Pluto's underworld. |
