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 Greek mythology in popular culture Elements of Greek mythology have appeared many times in culture and pop culture. The Greek myths had originally been adopted into the culture of ancient Rome, and have been frequently incorporated by Western cultural movements since then, particularly since the Renaissance. Mythological elements have been used in Renaissance art and English poems, as well as film and literature, and songs and commercials. Along with the Bible and the works of Shakespeare, the myths of Greece and Rome have been the major "touchstone" in Western culture for the past 500 years. These elements include the gods