"Pluto was discovered in 1930. Pluto was long considered our solar system's ninth planet. But after the discovery of similar intriguing worlds deeper in the distant Kuiper Belt, icy Pluto was reclassified as a dwarf planet. This new class of worlds may offer some of the best evidence about the origins of our solar system. Pluto is also a member of a group of objects that orbit in a disc-like zone beyond the orbit of Neptune called the Kuiper Belt. This distant realm is populated with thousands of miniature icy worlds, which formed early in the history of our solar system. These icy, rocky bodies are called Kuiper Belt objects or w:Transneptunian objectstransneptunian objects."
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National Aeronautics and Space Administration (NASA)in: Pluto: Overview, NASA
https://en.wikiquote.org/wiki/Pluto
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Pluto
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