2006 TOP TEN Number 10

Back in February, we reported that astrophysicists discovered an object farther from Pluto was actually larger than the ninth planet. This discovery caused an uproar in the astronomy community. Many scientists began disputing Pluto "planetary" status.

Then in August, thousands of astronomers from all over the world gathered for a twelve day meeting in Prague to decide what constituted "planetary" status and properly define the term. Upon completion of their conference, the group approved new guidelines that downsized our solar system from nine planets to eight.

Pluto was re-classified as a "dwarf planet".