ESO / L. CALCADA AND NICK RISINGER / SCIENCE PHOTO LIBRARY ESO / L. CALCADA AND NICK RISINGER / SCIENCE PHOTO LIBRARY
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Eris and Dysnomia. Computer illustration of the dwarf planet Eris (left) with its only known moon Dysnomia (upper right). Eris, formerly 2003 UB313 or Xena, is now thought to be smaller than previously estimated and about the same size as Pluto. Its surface is extremely reflective and probably covered in frost formed from the frozen remains of its atmosphere.
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