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Eris
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Eris An image taken by the Hubble Space Telescope showing the dwarf planet Eris in visible light.
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View of the Andromeda Galaxy (Messier 31, M31).
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Eris
Eris The dwarf planet Eris, with the Sun visible at lower right, in an artist's rendering.

Eris

astronomy
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Also known as: 2003 UB313, Xena
Written by
Clark R. Chapman
Senior Scientist, Department of Space Studies, Southwest Research Institute, Boulder, Colorado. Coauthor of Cosmic Catastrophes; author of Planets of Rock and Ice.
Clark R. Chapman
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Eris, large, distant body of the solar system, revolving around the Sun well beyond the orbits of Neptune and Pluto in the Kuiper belt. It was discovered in 2005 in images taken two years earlier at Palomar Observatory in California, U.S. Before it received its official name, Eris was known by the provisional designation 2003 UB313; it was nicknamed “Xena” by its discoverers and also briefly termed the “10th planet.” With a diameter of 2,326 km (1,445 miles), Eris is slightly smaller than Pluto (diameter 2,370 km [1,473 miles]). Both it and Pluto are classified as dwarf planets under categories ...(100 of 196 words)

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