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On another world, a day may not match the human body clock. Your body uses light to help control sleep, hormones, body temperature, and alertness. Mars has a day about 39 minutes longer than Earth's. That sounds small, but teams working on Mars missions have already had to adjust their schedules to Martian time. Future settlers may use carefully timed lights to keep their bodies in sync. Living on another planet could mean teaching the human body when morning begins.