The Ice Lice, a temperature boundary in which if planets are far away enough from the sun, things like water and gas condense and turn solid. Earth Mars, Venus and Mercury are all inside of it and therefore, terrestrial planets. this is also why Saturn's rings are made of ice. That's it in a nutshell, I know this is a troll post but I wanted to have my fun. "this is not a troll post" Oh really? [quote]the furthest planet from the Sun[/quote] Source: http://en.wikipedia.org/wiki/Frost_line_%28astrophysics%29