In 2006, the Hubble Telescope discovered two moons orbiting around Pluto, the ninth and smallest planet of our solar system. These two moons of Pluto are two to three times farther away and 5,000 times fainter than Pluto's large moon Charon, which was discovered in 1978. The International Astronomical Union has dubbed the two moons of Pluto, Nix and Hydra. The two moons have their roots in Greek mythology. The moon Nix takes its name from a derivative of Nyx, the Greek goddess of darkness, while the moon Hydra takes its name directly from the nine-headed serpent guardian of the underworld.