I see Pluto has been demoted!

no longer a planet as its not big enough!

From what I've read, the reason being is that there are many objects being found at the edge of our solar system that are bigger than Pluto but are obviously not planets, just rock. Therefore scientists had to come up with a definition of a planet before things got out of hand. They did and now Pluto is not a planet. Its smaller than our moon!