natural satellite of the dwarf planet Pluto
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Nix is a small moon that orbits the dwarf planet Pluto in the outer reaches of our solar system. It was discovered in 2011 and is notable as one of several moons around Pluto, helping scientists understand the complex system of objects that surround this distant world.
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Nix, formal designation (134340) Pluto II, is a natural satellite of Pluto, with a diameter of 49.8 km (30.9 mi) across its longest dimension. It was discovered along with Pluto's outermost moon Hydra on 15 May 2005 by astronomers using the Hubble Space Telescope, and was named after Nyx, the Greek goddess of the night. Nix is the third moon of Pluto by distance, orbiting between the moons Styx and Kerberos.
Nix was imaged along with Pluto and its other moons by the New Horizons spacecraft as it flew by the Pluto system in July 2015. These images reveal a large reddish area on Nix that is likely an impact crater.