It took astronauts 33 days to grow enough red romaine lettuce to make a small salad. NASA hide caption

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This Salad Is Outta This World: Astronauts Eat Greens Grown In Space

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Mission to Mars: Six explorers lived in this simulated Mars habitat in Hawaii for four months, part of a NASA study to test the role of cooking and food on an extended space mission. Sian Proctor/NASA HI-SEAS hide caption

toggle caption Sian Proctor/NASA HI-SEAS