Hydra, formally designated Pluto III, is the second-largest moon of Pluto, slightly bigger than Nix, with a diameter of about 51 kilometers across its longest dimension. It was discovered alongside Nix on 15 May 2005 by astronomers using the Hubble Space Telescope and was named for the nine-headed serpent of the underworld in Greek mythology; by distance it is the outermost of Pluto's five known moons, orbiting beyond Kerberos.
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Source Wikipedia: Hydra (moon)
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1. Wikipedia: Hydra (moon)
Article text
Hydra, formal designation (134340) Pluto III, is a natural satellite of Pluto, with a diameter of approximately 51 km (32 mi) across its longest dimension.
Infobox: magnitude
22.9-23.3 (measured)
Lead sentence: discovery of Hydra
Hydra was discovered along with Nix by astronomers using the Hubble Space Telescope on 15 May 2005, and was named after the Hydra, the nine-headed underworld serpent in Greek mythology.
In Group: Moons of Pluto, Lead sentence
Hydra, formal designation (134340) Pluto III, is a natural satellite of Pluto, with a diameter of approximately 51 km (32 mi) across its longest dimension.
View the SourceWikidata: Hydra
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