Pluto was discovered in 1930 and is the second-largest known dwarf planet, behind Eris. It was originally considered to be the ninth planet in the solar system, but was reclassified as a dwarf planet in 2006. It is compo... More »

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Pluto is a dwarf planet in the area of the Kuiper belt, which is an area with many dwarf planets, according to the National Aeronautics and Space Administration (NASA). The dwarf planet is after Neptune in the planetary ... More »

According to NASA, Planet X does not exist, so there are no facts about it. As of 2015, the space agency's Wide-Field Infrared Survey Explorer, or WISE, found no evidence of a large, undiscovered planet within the solar ... More »

Pluto became a dwarf planet in 2006. Upon being stripped of its title as a planet, Pluto joined two other celestial bodies, called Eris and Ceres, in the category of dwarf planets. The decision to reclassify the former p... More »

Pluto is a dwarf planet in the area of the Kuiper belt, which is an area with many dwarf planets, according to the National Aeronautics and Space Administration (NASA). The dwarf planet is after Neptune in the planetary ... More »

Pluto does not have a weight, because weight is a force exerted by one gravitational body on another gravitational body. The dwarf planet Pluto has a mass of 1.31 x 10^22 kilograms, and it's weight would depend on the ac... More »

As of 2014, Pluto has five recognized moons. The largest moon, Charon, was discovered in 1978, followed by the discoveries of Nix and Hydra in 2005, Kerberos in 2011 and Styx in 2012. Pluto may have as many as 10 moons. More »