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  1. science.nasa.gov › dwarf-planets › plutoPluto - NASA Science

    Pluto is a dwarf planet located in a distant region of our solar system beyond Neptune known as the Kuiper Belt. Pluto was long considered our ninth planet, but the International Astronomical Union reclassified Pluto as a dwarf planet in 2006. NASA's New Horizons was the first spacecraft to explore Pluto up close, flying by the dwarf planet and ...

  2. Answer. 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 ...

  3. Introduction Pluto is a complex and mysterious world with mountains, valleys, plains, craters, and glaciers. It is located in the distant Kuiper Belt. Discovered in 1930, Pluto was long considered our solar system’s ninth planet. But after the discovery of similar intriguing worlds deeper in the Kuiper Belt, tiny Pluto was reclassified as a dwarf […]

  4. Jan 5, 2012 · In 2006, the IAU voted to remove Pluto from the list of planets in the Solar System. Instead, Pluto, and other large objects would be classified as Dwarf Planets. Why Pluto is no longer a planet.

  5. Oct 28, 2021 · Some scientists argue that Pluto’s fascinating geology should qualify it as a planet. For 76 years, Pluto was the beloved ninth planet. No one cared that it was the runt of the solar system, with a moon half its size. No one minded that it had a tilted, oval-shaped orbit. Pluto was a weirdo, but it was our weirdo.

  6. Aug 23, 2006 · Pluto has been voted off the island. The distant, ice-covered world is no longer a true planet, according to a new definition of the term voted on by scientists today. "Whoa! Pluto's dead," said ...

  7. en.wikipedia.org › wiki › PlutoPluto - Wikipedia

    Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is the ninth-largest and tenth-most-massive known object to directly orbit the Sun. It is the largest known trans-Neptunian object by volume, by a small margin, but is less massive than Eris.