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  1. 4 days ago · Pluto, large, distant member of the solar system that formerly was regarded as the outermost and smallest planet. In 2006 a group of experts in the scientific community voted to give Pluto the new classification of dwarf planet. Learn more about Pluto in this article.

    • Pluto's Moons

      Unlike most of the other satellites in the solar system,...

    • The Atmosphere

      Pluto - Atmosphere, Composition, Temperature: Although the...

  2. 5 days ago · Pluto is a dwarf planet in the Kuiper Belt, a region of icy objects beyond the orbit of Neptune. It was discovered in 1930 by American astronomer Clyde Tombaugh and was considered the ninth planet in the solar system until it was reclassified as a dwarf planet in 2006.

  3. 2 days ago · Planet, broadly, any relatively large natural body that revolves in an orbit around the Sun or around some other star and that is not radiating energy from internal nuclear fusion reactions. There are eight planets orbiting the Sun in the solar system.

    • The Editors of Encyclopaedia Britannica
  4. 4 days ago · Now Pluto satisfies the first two of these conditions, but not the third, with a number of objects in the Kuiper Belt having similar orbits as Pluto, including the dwarf planet Eris which played a major role in the demotion of Pluto. For a planet to have cleared its orbit, all other objects must be either ejected from the path, impacted the ...

  5. 5 days ago · Unlike most of the other satellites in the solar system, Pluto’s four smaller moons are not in synchronous rotation with the planet; that is, their rotation period is not the same as their orbital period. Rotation periods range from 0.4295 day for Hydra to 5.31 days for Kerberos.

  6. 5 days ago · The solar system currently consists of eight planets — Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Pluto was the ninth planet of the solar system before it was demoted from ...

  7. 2 days ago · According to his analysis, Pluto's ocean is located under a surface layer that is between 40 and 80 km thick. This layer acts as an insulator, ensuring that the inland ocean remains in a liquid state. For decades, planetary scientists assumed that Pluto was too cold to house an inland ocean. Orbiting far beyond the "Ice Line" of the Solar ...