What is a Planet?

The Next Great Planet Debate, MSNBC

“Many astronomers say the definition that the IAU came up doesn’t adequately reflect the diversity of worlds we see even in our own solar system – and arguably, might even exclude Jupiter as an official planet. Now a replay of the “Great Planet Debate” has been scheduled for August. Pluto may remain in the pint-size pigeonhole – but the other planets, in our solar system and beyond, would get their own pigeonholes as well.”