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Even when you're millions of miles from home, you can't escape certain facts of life. When astronauts are orbiting hundreds of miles above Earth's surface, they still have to eat, sleep and go to the bathroom. Of course, the mechanics of using the toilet -- and disposing of the resulting waste -- in zero gravity can get a little tricky.
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Even in outer space, astronauts have to sleep, eat -- and relieve themselves. See more pictures of the space shuttle.
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