Will the real ninth, tenth, eleventh and twelfth planets please stand up?

This relates to the hubbub over 2003 UB313 and other objects that some say ought to be called planets, while Pluto ought to be taken off the list.


"The world's astronomers, under the auspices of the International Astronomical Union (IAU), have concluded two years of work defining the lower end of the planet scale: what defines the difference between 'planets' and 'solar system bodies'? If the definition is approved by the astronomers gathered from 14 to 25 August 2006 at the IAU General Assembly in Prague, our Solar System will consist of 12 planets: Mercury, Venus, Earth, Mars, Ceres, Jupiter, Saturn, Uranus, Neptune, Pluto, Charon and 2003 UB313.

"The IAU is a worldwide organization of distinguished astronomers. It has been the official arbiter of planetary and satellite nomenclature since its founding in 1919."