Figure 14-19: R I V U X G

Pluto and Its Satellites This Hubble Space Telescope image shows Pluto, its large satellite Charon, and the two small satellites Nix and Hydra. The fourth and fifth moons of Pluto (referred to as P4 and P5) do not have official names as of this writing. Estimates put the sizes of P4 and P5 between 10 and 34 km across. Nix is named for the mythological goddess of the night who was the mother of Charon; Hydra in mythology was a nine-headed, poisonous serpent who guarded the entrance to Hades.

(Note: The streaks are image artifacts.) (NASA/ESA/Mark Showalter [SETI Institute])