So mars used to have water and maybe a biosphere, and it all went away. Mars has two moons, whose orbit is decaying significantly. What if it used to have a third moon, which decayed long ago. Dya suppose that might have had a terminal impact on things? Just wondering. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist