Pluto is a small icy world discovered in 19350 and can be found at a mean distance of 5.9 billion km from the Sun. Its orbit is highly eccentric, so much so that at times it is closer to the Sun than Neptune. Pluto is has three moons, Charon, Nix and Hydra.
In 2006 the International Astronomical Union downgraded Pluto's status from planet to dwarf planet of which it the second largest next to Eris. Also in 2006 NASA launched the New Horizons spacecraft destined to reach Pluto in 2015, the first probe ever to undertake the trip.
Related entries: Deimos
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