Breathing Moonrocks
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Apollo 17 geologist Harrison "Jack" Schmitt scoops up some oxygen-rich moon rocks and soil.
An early, persistent problem noted by Apollo astronauts on the Moon was dust. It got everywhere, including into their lungs. Oddly enough, that may be where future Moon explorers get their next breath of air: The moon's dusty layer of soil is nearly half oxygen. The trick is extracting it.
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