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The second dwarf planet to be officially recognized by the International Astronomical Union (IAU) was Eris, which was designated as a dwarf planet in 2006. Eris is located in the scattered disc region of the solar system and is known for its size, which is similar to that of Pluto. Its discovery in 2005 prompted a re-evaluation of the definition of planets, ultimately leading to the classification of both Pluto and Eris as dwarf planets.

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