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→Discovery: Don't think the Hydra guarded the underworld - that was Cerberus.
The Hubble Space Telescope Pluto Companion Search Team examined Pluto and its already-known moon [[Charon]] using the [[Hubble Space Telescope]]'s Advanced Camera for Surveys.<ref name=team1/> The stated discovery date of May 15, 2005 is the date that the discovery images were taken; the discovery was announced only after confirmatory comparison with previous images of the Plutonian system.<ref name=hubble/>
The Hubble Space Telescope Pluto Companion Search Team examined Pluto and its already-known moon [[Charon]] using the [[Hubble Space Telescope]]'s Advanced Camera for Surveys.<ref name=team1/> The stated discovery date of May 15, 2005 is the date that the discovery images were taken; the discovery was announced only after confirmatory comparison with previous images of the Plutonian system.<ref name=hubble/>
In Greek mythology, the ''[[Hydra]]'' was a nine-headed monster who guarded the gates of the underworld until [[Hercules]] destroyed it. The names given to Hydra and the middle moon [[Nix]] are also the initials of the NASA mission ''New Horizons'', launched in 2006.
In Greek mythology, the ''[[Hydra]]'' was a nine-headed monster who was eventually destroyed by [[Hercules]]. The names given to Hydra and the middle moon [[Nix]] are also the initials of the NASA mission ''New Horizons'', launched in 2006.
== Orbital characteristics ==
== Orbital characteristics ==