Last updated on April 21, 2014 at 7:52 EDT
Pluto and Its Moons Charon Nix and Hydra- Unlabeled
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Pluto and Its Moons: Charon, Nix, and Hydra- Unlabeled

April 22, 2009
A pair of small moons that NASA's Hubble Space Telescope discovered orbiting Pluto now have official names: Nix and Hydra. Photographed by Hubble in 2005, Nix and Hydra are roughly 5,000 times fainter than Pluto and are about two to three times farther from Pluto than its large moon, Charon, which was discovered in 1978.