Re: planetoid bodies outside the orbit of pluto

There's not a lot of detailed information about trans-Neptunian or Kupier 
Belt Objects (KBOs) because they're so faint and hard to track. A good web 
page which gives a proposed research protocol for finding out this very 
information (along with a summary of what _is_ known) can be found at:

http://www.nas.edu/ssb/neptmenu.htm

you'll also note from this page that Pluto itself is now considered to be 
one of these objects--which is why they're called trans-Neptunian instead 
of trans-Plutonian.