Posted 05 September 2007 - 07:20 PM
Well, a couple of things to keep in mind (though I cannot remember the exact criteria placed forth for the definition of a planet). I personally do not believe Pluto to be a planet.
First off, though it is massive enough to form a spherical body under it's own gravity, it is a very low mass object, sharing more similarities with objects we already define as planets.
Second, the highly eccentric orbit. Pluto has an orbit that is far from being close to a circle (though no orbit is a circle, they are quite close, with mercury being the most eccentric, which isn't saying much) and the fact it is at a very steep angle to the plane of the solar system.
Third, There are many objects, Kupier Belt objects, that share many of the same qualities as Pluto, physically.
(More to come when I am free)
#: ssh God@Heaven.org
Password: CurvedSpace
/God> rm *
The BEST error message ever: "Cowardly refusing to create an empty archive."