seds.lpl.arizona.edu...
Has some good info, but like the above posts say...there isn't much fact or proven science in it.
I got the link from
here. It's a site hosted NASA, answering school
kids questions about Niburu/PX.
Hope you do a paper on it. It's an interesting topic. Doing a paper on a theory is not unheard of. There are plenty of papers on black holes,
wormholes, and singularities. These phenomena are pretty hard to nail down in nature as well. (I'll probably get swamped with retorts though...)