First details of manned Mars mission from NASA

OriginalArlen writes: The BBC has a first look at NASA's initial concepts for a manned Mars mission, currently pencilled in for 2031. The main vehicle would be assembled on orbit over three or four launches of the planned Ares V heavy lift rocket. New abilities to repair, replace, and even produce replacement parts will be needed to provide enough self-sufficiency a 30 months mission, including 16 months on the surface. The presentation was apparently delivered at a meeting of the Lunar Exploration Management Group, although there's nothing on their site yet.