Actually guys, we don't have 8 planets... we now have 12... @_@ I KNOW! SO WIERD!
Anyway, I'll explain. Because technology in space has been expanding over the many years, scientists have been finding other objects in space further than Pluto, and also right in the middle of our REGULAR Solar System that we never noticed before. Allow me to show you a picture:
http://www.sciencenews.org/articles/20060819/a7595_1602.jpg
In this picture, you will notice the addition of 3 planets (Charon, Ceres, and 2003 UB313, also known as Xena) They have decided that based on the facts that scientists have uncovered, they must now create "sub-categories" for planets. Pluto and Charon are very strange because they are actually a "double planet" because they travel together in that odd orbit that intersects with Neptune's orbit. Those two planets, as well as Xena, are known as "Icy Plutons" and Ceres (between Jupiter and Mars) is the current lone member of a group known as "dwarf planets"
So there's the scoop folks. Kids won't just be learning about our 8 Planets, they'll be learning about our 12 Planets, and the sub-categories of planets inside them. HOW CRAZY IS THAT! Now I know how old people feel when their grandson or granddaughter says something to them they don't know, and realize it was discovered AFTER they got out of school, and they had no idea, so it just makes them look old and stupid... @_@