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  2. Pluto - Wikipedia

    en.wikipedia.org/wiki/Pluto

    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.

  3. The tiny planet-not-planet that could: Pluto was discovered ...

    www.aol.com/short-uneventful-life-pluto-planet...

    Pluto's reign. For decades, students learned the phrase "My Very Educated Mother Just Served Us Nine Pizzas" to remember the order of the planets in the solar system: Mercury, Venus, Earth, Mars ...

  4. Scientists Want to Redefine What a Planet Is—What Does It ...

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    The definition of a planet has been a hot topic ever since a change kicked Pluto out of our planetary lineup in 2006. Now, a group of researchers is proposing a new definition yet again—one with ...

  5. Why is Pluto not a planet anymore? - AOL

    www.aol.com/finance/2020-05-26-why-is-pluto-not...

    Pluto was considered a planet up until 2006, when researchers at the International Astronomical Union voted to "demote" it to dwarf planet.

  6. Geology of Pluto - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Pluto

    The geology of Pluto consists of the characteristics of the surface, crust, and interior of Pluto. Because of Pluto's distance from Earth, in-depth study from Earth is difficult. Many details about Pluto remained unknown until 14 July 2015, when New Horizons flew through the Pluto system and began transmitting data back to Earth. [1]

  7. Exploration of Pluto - Wikipedia

    en.wikipedia.org/wiki/Exploration_of_Pluto

    A Pluto orbiter/lander/sample return mission was proposed in 2003. The plan included a twelve-year trip from Earth to Pluto, mapping from orbit, multiple landings, a warm water probe, and possible in situ propellant production for another twelve-year trip back to Earth with samples. Power and propulsion would come from the bimodal MITEE nuclear ...

  8. Why isn't Pluto a planet anymore? - AOL

    www.aol.com/news/why-isn-apos-t-pluto-200254923.html

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  9. Definition of planet - Wikipedia

    en.wikipedia.org/wiki/Definition_of_planet

    However, acceptance of Eris as the tenth planet implicitly demanded a definition of planet that set Pluto as an arbitrary minimum size. Many astronomers, claiming that the definition of planet was of little scientific importance, preferred to recognise Pluto's historical identity as a planet by "grandfathering" it into the planet list. [47]