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"As the United States considers a manned mission to Mars by the mid-2030s, ongoing research is beginning to raise doubts about the ability of human astronauts to survive such a multi-year journey in zero gravity without severe and possibly permanent physical or psychological damage."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Science_News/2012/03/25/SciTechTalk-Physical-psychiatric-issues-face-multiyear-space-voyagers/UPI-78391332669600/?st_rec=82701340533860>