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The Bruce Murray Space Image Library

Eris and its newly discovered moon

Eris and its newly discovered moon

W.M. Keck Observatory

Eris and its newly discovered moon
This is the discovery image of the moon Dysnomia of dwarf planet Eris, as seen on September 10, 2005. The discovery of the moon is important because it will permit scientists to determine the mass of Eris.

Original image data dated on or about September 10, 2005

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