Scientific Proof for 2012 Doomsday?

Patryk Lykawka from the University of Kobe, Japan is convinced that in the far ends of our solarsystem, there is a unknown Ice-planet. This Ice-planet, which is said to have about the size of the earth, could possibly explain some of the odd characteristics that the kuiper-belt calls its own.
For example, that it suddently stops on half way towards the sun. Alot of scientists don't fully dismiss the theory of Lykawka that a "planet X" may be existant. In other words, it can be very possible that the theories of "Nibiru" are actually true......