Here are a few links that may be of assistance in understanding what is behind this particular comment.
http:// http://news.bbc.co.uk/1/hi/sci/tech/3511678.stm
http:// http://www.gps.caltech.edu/~mbrown/sedna/
http:// http://www.cnn.com/2004/TECH/space/03/14/planet.discovery/

And for the official site of Nasa and their view on this whole thing, check out their site at:
http:// http://www.nasa.gov/vision/universe/solarsystem/planet_like_body.html

I am not sure if this will help any, but it is interesting to say the least.

Rev. Alimae

Rev. Alimae