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  1. 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 .

  2. Jul 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...

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

    Pluto was once our ninth planet, but is now a dwarf planet. Learn about its discovery, exploration, features, and more from NASA's official website.

  4. 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.

  5. Learn how the International Astronomical Union defined the term planet in 2006 and why Pluto was demoted to a dwarf planet. Find out the scientific reasoning and the public reaction to the change in the solar system.

  6. Dec 29, 2023 · A controversial article that argues for Pluto's planetary status, despite the IAU's reclassification as a dwarf planet in 2006. The author challenges the criteria of planetary definition and cites the history, exploration and uniqueness of Pluto.

  7. Discovered in 1930, Pluto was long considered our solar system's ninth planet. But after the discovery of similar intriguing worlds deeper in the distant Kuiper Belt, icy Pluto was reclassified as a dwarf planet.