Comment Just don't, until you get a functional biosphere. (Score 1) 156
That's my suggestion. Biosphere 1 and 2 were both failures. We don't know enough to make sustainable closed biospheres work on Earth, much less in orbit or on Mars. When we have something that lasts 10 years, we might be on to something. Until then, practice, practice, practice... Baby steps. How about an L5 or two to start.