The Planet Definition Committee has just defined a planet as under :
1) A planet is a celestial body that (a) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (b) is in orbit around a star, and is neither a star nor a satellite of a planet.
According to the definition the astral body we have been calling a planet in all our school text books is now a planet officially.The only problem is that instead of the nine planets we have been taught about we now have 12 planets which conform to the definition.The extra ones are Ceres(the largest asteroid between Mars and Jupiter),Charon (Pluto’s Moon counting as a planet because it is too far away to be counted as a satellite),UB313 , a far away rock that is even bigger than the Pluto.
The trouble is that there are several small-sized bodies in the Kuiper belt beyond Neptune .Should we call them planets too ? A better , more pragmatic approach would be to stop talking about precise definitions in astronomy because we run into hot waters whenever we attempt to do so.