Nix is a natural satellite of Pluto, with a diameter of 49.8 km 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.

Orbital period: 25 days

Gravity: 0.000163 m/s²

Discovered: May 15, 2005

Discoverers: Alan Stern, Marc Buie, Hal A. Weaver,

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