Why, because it has living things on it?
We're talking about rocky cores vs. planetoids with no rocky cores.
The general argument is that if pluto is a planet, we're going to have to qualify hundreds of thousands of objects in the Oort cloud as planets too.
--\n-------------------------------------------------------------------\n* Jack Troughton jake at consultron.ca *\n* [link|http://consultron.ca|http://consultron.ca] [link|irc://irc.ecomstation.ca|irc://irc.ecomstation.ca] *\n* Kingston Ontario Canada [link|news://news.consultron.ca|news://news.consultron.ca] *\n-------------------------------------------------------------------