Sorry had to search on this before posting as it was rumoured for some time and has even been Quoted on many spoof reportsbut it is now Official following the resolution by the IAU Pluto will be the bench mark for a new and growing class of planet called Plutons or whick Pluto will now be a part
for more from IAU here is the link
so now there is 12 planets in our solar system .. listed as follows Mercury, Venus, Earth, Mars, Ceres, Jupiter, Saturn, Uranus, Neptune, Pluto, Charon and 2003 UB313.
The Planet of Pluto was orriginally named by an 11 year old in 1930.. This link is from NASA and contains an interview with Venetia Phair
