ubercat wrote:OK. Let me see if I have this right. Pluto isn't a planet because it's orbit
crosses Neptune's. Then what the fuck does that make Neptune? Neptune
hasn't cleared away pluto, and it's therefor not a planet also?
Holy fuck. This is worse the when we didn't have a definition for a planet.
I thought it was because they discovered a tenth orbiting mass beyond pluto, which was approximately the same size and constitution. Apparently there are nore big rocks out there that pretty much fit the bill to be called 'planets' if pluto is the fundamental criterion.
other arguments i've heard is that pluto just gets grandfathered in as a planet, and the others are just considered satellites or whatever.