NASA: National Aeronautics and Space Administration

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  1. Question

    Is Xena officially a planet now with Pluto crossed off the list?

    The object that once had the informal nickname of Xena now has a real name, Eris. It and Pluto (and a handful of similar objects in the outer solar system) are classed as dwarf planets.

    David Morrison
    NAI Senior Scientist

    January 22, 2009