SUMMARY: It's been said that an army travels on its stomach. Well, that's true with astronauts too. Especially when they're headed to Mars, and might need to stay a few years; or maybe even build a colony. The question is, how much space, soil, water, energy and air does it take to keep astronauts alive on another planet if they're growing all their own food? Ray Collins has locked himself inside a greenhouse in Alaska, and he's working towards discovering the answer.
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