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Hydra and Nix, roughly 5,000 times fainter than Pluto, are about two to three times as far from Pluto as its large moon, Charon. The brighter, outer small satellite, Hydra, was provisionally named S/2005 P 1, and the fainter, inner small satellite, Nix, was provisionally named S/2005 P 2.

Credit: NASA/Space Telescope Science Institute (STScI)

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