Shannon Rupert, back in San Diego after two weeks in a simulated Mars laboratory in the Utah desert, was craving vegetables. The greenhouse outside the MARS Desert Research Station recently blew apart in 92 mph winter winds, so Rupert’s crew had had little fresh produce. Now, back at the San Diego chapter of The Mars Society, Rupert was munching on celery and carrots, describing for her colleagues an eerie Utah landscape of red and pink