Pluto was discovered in 1930 by Clyde Tombaugh. It was classified as a planet until 2006 when the International Austronomical Union (IAU), after a long battle, reclassified Pluto as a "dwarf planet", and gave it the classification number of 134340 Pluto.
Plutos designation was hotley debated due to the discovery of Eris, a much larger "dwarf planet" than Pluto, and part of the Kuiper Belt. This spurred on a scientific debate on what truly can be classified as a "planet".
NASA launched a satellite to study Pluto in January 2006, under the mission name "New Horizons". New Horizons is estimated to arrive at Pluto in July 2015, where it will capture images of both Pluto and its largest of three moons, Charon. After this New Horizons will keep going into the Kuiper Belt to hopefully explore two other "dwarf planets" within.
- Pluto was named by Venetia Burney, after the Greek god of the underworld.
- Walt Disney supposedly named his famous dog after the planet, to cash in on the popularity.