[martin_fierro]

I thought they were naming the 10th planet Qaoar, or something.

??

[SunkenCiv]

Quaoar (sp?) was the name assigned to one of the KBOs of a few years ago.

same team found Quaoar and "Xena" or "Persephone" or (my suggestion) "Brown's Planet".

http://www.gps.caltech.edu/~chad/quaoar/

[RightWhale]

they were naming the 10th planet Qaoar,

That was several planets ago. 50,000 AU is a lot of space. There could be a planet out there bigger than Jupiter and we wouldn't know about it. There could even be a brown dwarf star and its own planetary system and we wouldn't know.