Comment According to the Sumerians (Score 1) 306
...They knew of some sort of death star/planet and they called it "Nibiru" which means "Planet of the Crossing" (why would they name it that?!) and they drew it on one of their tablets along with the other planets.
BUT the Sumerians said it takes a 3600 year orbit.
http://en.wikipedia.org/wiki/Nibiru_(Babylonian_astronomy)
http://en.wikipedia.org/wiki/Nibiru_collision
I've read books about it... very interesting stuff.