This site is crazy :) http://9taxi.in.net 9 taxi None of this is set in stone, of course, since most of the key characteristics — including Comet ISON's exact size, density and spin — remain unknown. And it's notoriously difficult to predict the behavior of comets, especially "dynamically new" ones like ISON making their first trip to the inner solar system from the distant, frigid Oort Cloud.