Hydra (moon) the Hydra, the nine-headed serpent that battled Heracles in Greek mythology. The nine heads of Hydra are a reference to Pluto's tenure as the ninth planet; its initial, "H", refers to the Hubble Telescope, which discovered Hydra and, together with Nix, to the "New Horizons" mission whose safe passage was the motivation for taking the Hubble images. Hydra orbits the barycenter of the system in the same plane as Charon and Nix, at a distance of about 65,000 km. Its eccentricity of 0.0059 is small, but significantly non-zero, and the largest of those of Pluto's small moons (slightly larger than
Greek mythology in popular culture a part in the "slow erosion of historical sense." The 1996 video game "Wrath of the Gods" was an adventure game set in mythical Greece, and had an educational component where players could learn about Greek myths and history and see images of Greek art in cut-a-ways. In 2003, GameSpy remarked that the 1986 video game "Kid Icarus", which had become very popular and then faded to relative obscurity, had followed a trajectory similar to its namesake from Greek mythology, Icarus, who had escaped imprisonment when his father created wings from feathers and wax, but ignoring his father's advice, Icarus