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- Pluto was downgraded to the status of a dwarf planet by the International Astronomical Union (IAU) in 2006 because it did not meet the three criteria the IAU uses to define a full-sized planet1. Essentially Pluto meets all the criteria except one—it “has not cleared its neighboring region of other objects”1. Pluto was discovered in 1930 and was declared to be the ninth planet from the Sun2. However, its status as a planet was questioned following the discovery of several objects of similar size in the Kuiper belt and the scattered disc, including the dwarf planet Eris2.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.
The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. Essentially Pluto meets all the criteria except one—it “has not cleared its neighboring region of other objects.”
www.loc.gov/everyday-mysteries/item/why-is-pluto …After Pluto was discovered in 1930, it was declared to be the ninth planet from the Sun. Beginning in the 1990s, its status as a planet was questioned following the discovery of several objects of similar size in the Kuiper belt and the scattered disc, including the dwarf planet Eris.
en.wikipedia.org/wiki/Pluto - People also ask
Why is Pluto no longer a planet? - BBC News
WEBJul 13, 2015 · For more than 70 years, Pluto was one of nine planets recognised in our Solar System. But in 2006, it was relegated to the status of dwarf planet by the International Astronomical Union (IAU).