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Eris

Britannica Concise Encyclopedia | Date: 2007

Large, distant body of the solar system, revolving around the Sun well beyond the orbits of Neptune and Pluto. Found in telescopic images in 2005, it was nicknamed “Xena” by its discoverers and also briefly termed the “10th planet”; for a time it was provisionally designated 2003 UB313. Its diameter of roughly 1,550 mi (2,400 km) makes Eris slightly larger than Pluto. Both it and Pluto are classified as dwarf planets under the categories for bodies orbiting the Sun defined in August 2006 by the International Astronomical Union.

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