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Hydra (moon) - Wikipedia
Hydra - NASA Science
Pluto Moons: Facts - NASA Science
Moons of Pluto - Wikipedia
Hydra Emerges from the Shadows - NASA
Pluto's Moon Hydra - Universe Today
NASA – Pluto and Its Moons: Charon, Nix and Hydra - Science@NASA
New Horizons Makes its First Detection of Pluto’s Moon Hydra
Hydra viewed by New Horizons - The Planetary Society
Hydra Emerges from the Shadows - NASA Jet Propulsion …