Two newly discovered moons orbiting Pluto were named Nix and Hydra.
Nix is named after the Greek goddess of darkness and night, who also happens to be the mother of Charon. Hydra, on the other hand, is named after a mythological multi-headed serpent that Hercules defeated. Nix and Hydra were only first spotted by the Hubble Space Telescope in June 2005, partially because their orbits are much further out than Pluto’s previously known moon, Charon.