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
Modern understanding of Greek mythology about gods than about the physical world; it is about the human mind and must be read symbolically. Karl Kerenyi, one of the founders of modern studies in Greek mythology, gave up his early views of myth, in order to apply Jung's theories of archetypes to Greek myth. The origins of Greek mythology are an open question. In antiquity, historians such as Herodotus theorized that the Greek gods had been stolen directly from the Egyptians. Later on, Christian writers tried to explain Hellenic paganism through degeneration of Biblical religion. According to the Scriptural theory, all mythological legends (including Greek mythology)