Pluto’s Nemesis is Eris

BBC NEWS | Science/Nature | Astronomers name ‘world of chaos’

So, the non-planet formerly known as Xena now has an 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.

Nice to see the astronomical community has retained its sense of humour after all the fuss over Pluto…