The distant world whose discovery prompted leading astronomers to demote Pluto from the rank of "planet" has now been given its own official name.
Having caused so much consternation in the International Astronomical Union (IAU), the object has been called Eris, after the Greek goddess of discord. Eris' discoverer, Michael Brown of the California Institute of Technology, called it "too perfect to resist".
Eris [wiki] is larger than Pluto, which put scientists in the fix of having to call them both planets - or neither. Both bodies have now been put in the new classification of "dwarf planets".
In mythology, Eris caused a quarrel among goddesses that sparked the Trojan War. In real life, Eris also caused strife, forcing scientists to produce a strict definition of the term planet - and that eventually led to Pluto losing the status it had held since its discovery in 1930.
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