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They are moons of Pluto.
Pluto has three known moons, Charon, Nix, and Hydra.
Nix Candida (tale) Nix pallidus
Martha Nix's birth name is Martha Aileen Nix.
Laynce Nix's birth name is Laynce Michael Nix.
Robert Nix's birth name is Robert L. Nix.