>Of course, you might also consider Sedna a tenth planet - especially if you insist on calling Pluto a planet. Sedna is estimated to be almost as big as Pluto. The limit, between what is a planet and what is a planetoid, is of course quite arbitrary, and might consider factors such as size (both volume and mass), the presence of an atmosphere, the shape (larger planets are round, due to their atmosphere), and perhaps a few more.

Well this makes sense now... it's a roadmap of the galaxy. I get it. We should call the next book "The HitchHackers Guide to Foxpro"... :)