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
Hydra the Revenge Hydra the Revenge Hydra the Revenge (sometimes simply shortened to Hydra) is a steel Floorless Coaster at Dorney Park & Wildwater Kingdom in Allentown, Pennsylvania, United States. It is the only Floorless Coaster in Pennsylvania and was built where the former wooden roller coaster Hercules once stood, which was closed and demolished at the end of the park's 2003 season. Its name comes from the Greek Mythology story where Hercules battled the Hydra. Site preparation began in late 2003, when on September 1, 2003, Hercules, a wooden roller coaster that sat in the current location of Hydra the Revenge, was