On 1/11/2011 1:12 PM, Marc Aramini wrote: > Then the domes would have to be green, no? Or invisible so that the trees are visible from Urth? It being green implies some sort of atmosphere to me. Think of the domes in SILENT RUNNING. -- Jeff Wilson - jwilson at io.com Computational Intelligence Laboratory - Texas A&M Texarkana < http://www.tamut.edu/CIL >