Didn't they find another planet past Pluto? I think that is what started it all. They were wanting to call it a Planetiod or something like that due to size but I think it was bigger than Pluto so now everything is being re-thought.

I remember an old song that had the line, " little blue planet, 3rd no 4th, no wait 3rd, no 4th from the sun, come and show me what you've done."

Hey, it was only 500 years ago, the earth was flat.