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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 · 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)....

  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.cnn.com › 2019/08/24 › worldWhy Pluto is no longer a planet (or is it?) - CNN

    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.

    • 1 min

  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. 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: orbit the sun, be round, and clear its neighborhood. Learn how the IAU defined the word "planet" in 2006 and why Pluto is now a dwarf planet.