GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Kuiper belt and Pluto. Artwork showing Pluto (large, right) in the Kuiper Belt. The Kuiper Belt is a collection of icy, rocky bodies that orbit the Sun at the outer region of the Solar System. It extends outwards from the orbit of Neptune, past the orbit of Pluto, to about two times the Sun-Pluto distance. Originally classified as a planet, Pluto is now considered to be a Kuiper Belt object (KBO). KBOs range in size from small rocks to Pluto-sized objects, such as Sedna, Quaoar and 2003 UB313.
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