It's a sign of the times when the universe gets restructured and even poor little Pluto is made redundant.
I guess that's the thing about science - things are always changing. When I was a little girl my Gran used to tell me how at school she had learnt that we'd never split the atom and I used to laugh. I guess my kids will now be laughing at me when I say I learnt there were 9 planets in our solar system - how old-school is that!?