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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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The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
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Saturn. Saturn and its rings. Second largest planet of the solar system. Space Art
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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
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Eris
Eris The dwarf planet Eris, with the Sun visible at lower right, in an artist's rendering.

Eris

astronomy
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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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
Britannica Editors
History

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...

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