In 2006, the International Astronomical Union changed Pluto's classification from a planet to a dwarf planet because the planet has not cleared its orbit of other objects. When a planet clears its orbit, all other object... More »

According to National Geographic, the primary reason Pluto was demoted from planet to dwarf planet status is its size relative to its satellite. All the other planets with moons are much larger than their satellites, whi... More » Science Astronomy Planets

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 »

In 2006, the International Astronomical Union redefined the criteria for what qualifies as a planet, causing Pluto to lose its designation as such. As of 2014, Pluto is considered one of five dwarf planets, with the othe... More »

In 2006, the International Astronomical Union decided that Pluto was not a planet in the Earth's solar system. Pluto was named a dwarf planet after a discovery of a similar-sized object deeper in the Kuiper belt, which w... More » Science Astronomy Planets

Pluto experiences four seasons that are determined by the tilt of the planet and its changing distance from the sun due to its eccentric orbit. As Pluto moves towards its furthest point from the sun and its north pole fa... More »

Pluto is referred to as a "dwarf planet" because of its location in space and its tiny size, which makes it unable to move other objects out of its orbit. Astronomers began calling Pluto a dwarf planet in 2003 when an as... More » Science Astronomy Planets