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Probing Question: Can a human survive a trip to Mars? President Bush`s recent proposal to focus NASA`s efforts on manned space exploration has rekindled efforts to define the human limits on long voyages in deep space. According to Jim Pawelczyk, associate professor of kinesiology at Penn State and a payload specialist on the 1998 Columbia mission, there are three major "showstoppers" that need to be addressed.
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