The solar system inhabitant that started the whole "what is a planet" debate has an official name. Dubbed 2003 UB313 but widely known by its nickname Xena, this body is now named Eris, after the Greek goddess of chaos and strife. The new name was announced by the International Astronomical Union, which also approved naming Eris' moon (known until now as Gabrielle) Dysnomia. Dysnomia was Eris' daughter and was another famed troublemaker in Greek mythology. Eris joins Pluto and the former asteroid Ceres in the new category of "dwarf planets."
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