> Honestly, I agree with Sam that the definition of "planet" has more cultural significance than it does scientific significance. Scientists are still going to want to study Pluto regardless of whether it's listed as the ninth planet or just one of the larger Kuiper Belt objects. However, the part of my brain that loves to categorize things craves a consistent definition of the word based on some objective standard.

In my more rebellious moments, I say there are only 4 planets; Saturn, Jupiter, Uranus, Neptune.

All else is rubble.

winter"Jupiter has moons bigger than the Earth"mute