In an interesting move, a large body of astronomers collected under the aegis of IAU (International Astronomers Union) decided to demote the status of Pluto to a dwarf planet, instead of regular planet. It means our solar system has only 8 planets and not 9, as we studied till now.
The declassification seems to have been done in view of a majority's concerns of Pluto being a largely frozen surface and dissimiliar in composition to the other 8 planets, and 3 other bodies in the solar system - Charon 3, a satellite of Pluto, 2003 UB313, and a huge asteroid between Mars and Jupiter qualify to become a planets, if Pluto (with relaxed admission norms) continues to be accepted as a planet.
Lots of rewriting of school textbooks needs to be done, around the world :)
How do you feel, having to lose one interesting planet from our system?