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No vision without gravity: "With plans to send humans to Mars by the 2030s, a mission that would require nine months of space flight one way, we don't really want to risk all of our astronauts going blind in the process. 'NASA ranks human health risks and the two top risks are radiation and vision issues,' Smith said. 'Is it number one or two? Some people would say it's number one, because we don't really know what the long-term implications are.' " - Source: MB https://quitter.no/url/737380 @rse https://quitter.no/url/737379