As there seem to bee too many candidate for the status of 10th planet of our solar system. So the discussion start about the qualifications for an object to be called planet. The consequences might be, that Pluto won't be called planet any longer. If a definition for planet is done, it should be consistent, that means if Pluto doesn't match, Pluto should be “dropped” as planet. Maybe there'll be found a definition not primarily based on size (and that the object isn't orbiting another planet), so that Pluto will still be planet, but any other object won't be.
Actually I can't think of something right now which would include Pluto and nothing else. A good definition could be to say it has to have a certain minimum size and to circle our sun primarily. Maybe some additional condition about the shape of the orbit, but here Pluto could get into problems as well…
So bye bye Rupert for now (I still think the 10th planet should be called Rupert).
