There were many iterations of the spacesuit before astronauts started wearing what they do today, but how do they work?
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Space Educator’s Handbook: The Spacesuit
http://er.jsc.nasa.gov/seh/suitnasa.html
“Earth's atmosphere is 20 percent oxygen and 80 percent nitrogen from sea level to about 75 miles up, where space begins. At 18,000 feet, the atmosphere is half as de
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