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Jul 13, 2015 · Nasa's New Horizons mission made a close pass of Pluto this week. For more than 70 years, Pluto was one of nine planets recognised in our Solar System. But in 2006, it was relegated to the...
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Learn how the International Astronomical Union demoted Pluto from a planet to a dwarf planet in 2006 based on a specific definition of planet. Find out why some people objected to the change and what it meant for the solar system.
Aug 24, 2019 · Pluto was long considered our solar system’s ninth planet. But should it ever have been demoted at all? Learn about the history and science of Pluto.
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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.”. The Rich Color Variations of Pluto.
Pluto was reclassified as a dwarf planet in 2006 after the discovery of similar worlds in the Kuiper Belt. Learn about its size, orbit, moons, surface, atmosphere, and more from NASA's website.
Jan 5, 2012 · Learn how Pluto was discovered, named and demoted from a planet to a dwarf planet by astronomers. Find out the criteria for being a planet and the challenges of exploring Pluto in the Kuiper Belt.
Pluto was once our ninth planet, but was reclassified as a dwarf planet in 2006. Learn about its discovery, exploration, features, and more from NASA's official website.
