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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. Dwarf planet - Wikipedia

    en.wikipedia.org/wiki/Dwarf_planet

    Gonggong (2007) A dwarf planet is a small planetary-mass object that is in direct orbit around the Sun, massive enough to be gravitationally rounded, but insufficient to achieve orbital dominance like the eight classical planets of the Solar System. The prototypical dwarf planet is Pluto, which for decades was regarded as a planet before the ...

  4. Charon (moon) - Wikipedia

    en.wikipedia.org/wiki/Charon_(moon)

    The dwarf planet systems Pluto–Charon and Eris–Dysnomia are the only known examples of mutual tidal locking in the Solar System, [20] though it is likely that Orcus–Vanth is another. [ 21 ] The reddish-brown cap of the north pole of Charon is composed of tholins , organic macromolecules that may be essential ingredients of life .

  5. Eris (dwarf planet) - Wikipedia

    en.wikipedia.org/wiki/Eris_(dwarf_planet)

    Eris (minor-planet designation: 136199 Eris) is the most massive and second-largest known dwarf planet in the Solar System. [ 22 ] It is a trans-Neptunian object (TNO) in the scattered disk and has a high- eccentricity orbit. Eris was discovered in January 2005 by a Palomar Observatory –based team led by Mike Brown and verified later that year.

  6. Astronomers discover 'geological wonderland' on Pluto

    www.aol.com/astronomers-discover-geological...

    The dwarf planet Pluto, which is smaller than Earth's moon, orbits about 3.6 billion miles away from th. It's not just the air on Pluto that is cold -- the volcanoes on the dwarf plant are frigid ...

  7. Michael E. Brown - Wikipedia

    en.wikipedia.org/wiki/Michael_E._Brown

    Michael E. Brown (born June 5, 1965) is an American astronomer, who has been professor of planetary astronomy at the California Institute of Technology (Caltech) since 2003. [1] His team has discovered many trans-Neptunian objects (TNOs), including the dwarf planet Eris, which was originally thought to be bigger than Pluto, triggering a debate ...

  8. Moons of Pluto - Wikipedia

    en.wikipedia.org/wiki/Moons_of_Pluto

    Moons of Pluto. The dwarf planet Pluto has five natural satellites. [1] In order of distance from Pluto, they are Charon, Styx, Nix, Kerberos, and Hydra. [2] Charon, the largest, is mutually tidally locked with Pluto, and is massive enough that Pluto and Charon are sometimes considered a binary dwarf planet.

  9. Clyde Tombaugh - Wikipedia

    en.wikipedia.org/wiki/Clyde_Tombaugh

    Clyde William Tombaugh / ˈtɒmbaʊ / (February 4, 1906 – January 17, 1997) was an American astronomer. He discovered the ninth planet Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper belt. At the time of discovery, Pluto was considered a planet, but was reclassified as a dwarf planet in 2006.