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  2. www.britannica.com › story › why-is-pluto-no-longer-a-planetWhy Is Pluto No Longer a Planet? | Britannica

    Learn how the International Astronomical Union defined the term planet in 2006 and why Pluto failed to meet the criteria. Find out the scientific reasoning behind the controversial decision and the public reaction to it.

  3. www.bbc.com › news › science-environment-33462184Why is Pluto no longer a planet? - BBC News

    Jul 13, 2015 · By Paul Rincon. Science editor, BBC News website. 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...

  4. www.space.com › why-pluto-is-not-a-planetWhy is Pluto not a planet? | Space

    Oct 13, 2022 · Pluto's so-called demotion from planetary status raises larger issues about how to define any object in the solar system, or even in space more generally. It shows that science...

  5. www.loc.gov › astronomy › itemWhy is Pluto no longer a planet? | Library of Congress

    Learn why Pluto was downgraded from a planet to a dwarf planet by the International Astronomical Union in 2006. Find out the criteria, history and controversy of this decision.

  6. www.popsci.com › why-is-pluto-no-longer-planetWhy is Pluto not a planet? | Popular Science

    Oct 17, 2018 · Pluto failed a three-part test to be a planet in 2006, when the IAU redefined the word. Learn why Pluto is not a planet anymore and what makes it different from the other worlds in the solar system.

  7. science.howstuffworks.com › pluto-planetWhy is Pluto no longer considered a planet? | HowStuffWorks

    Learn how Pluto lost its planetary status in 2006 and why some scientists still debate its classification. Find out the criteria for planets, dwarf planets and small solar-system bodies according to the IAU.

  8. 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 reclassification from NASA's official website.