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 with feathers to Greek mythology. The MGR Samadhi Memorial in Chennai, India, was redecorated in 2012 to include a pegasus, which symbolized "valour and energy". Hydra the Revenge is a Bolliger & Mabillard designed floorless roller coaster at Dorney Park & Wildwater Kingdom in Allentown, Pennsylvania with a Lernaean Hydra theme. The name of the ride pays tribute to the "Hercules" wooden roller coaster that once stood on the same spot. The theme itself is the Hydra coming back to life and seeking revenge over Hercules. During the Middle Ages, writers disdained the use of "pagan" influences such as Greek