Its been a blow that the famous pluto, will be demoted to a 'dwarf planet' from the solar system. As of now, the solar system will have 8 planets. What does this mean? Well, billions of (science) books will have to be reprinted... $$$.
Reason for change:
There are 2 more planets (Ceres, 2003 UB [Official name not comfirmed]) that were about to be included that managed to fit the previous definition. However, there are probably 100s more of such planets which... could flood your nice little map of the solar system.
Hence, the definition was redefined.
More...:
Ceres was once a planet before being demoted to an asteriod. It is now a dwarf planet.
Pluto was a planet for over 70 years.
Conclusion:
Science changes rapidly with time.
http://en.wikipedia.org/wiki/2006_redefinition_of_planet
http://en.wikipedia.org/wiki/Solar_system
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