On August 24, 2006, pluto was no longer considered a planet. It is considered a "dwarf planet" now along with 44 other known dwarf planets. Pluto was demoted to a dwarf planet because it does not dominate it's atmosphere. Most planets are much larger than their moons, while Pluto is only twice the size of its moon.
http://news.nationalgeographic.com/news/2006/08/060824-pluto-planet.html
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