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 at the Walter Kerr Theatre in March 2019. In the 19th century, Nathaniel Hawthorne wrote children's versions of the Greek myths, which he intended to "entirely revolutionize the whole system of juvenile literature." His work, along with the works of Bulfinch and Kingsley, have been credited with "recast[ing] Greek mythology into a genteel Victorian subject." The Percy Jackson & the Olympians series by Rick Riordan stars Percy Jackson the son of Poseidon. Riordan states that he created the character of Percy when trying to tell a story to help his son who has ADHD get interested in reading. In the