Other findings including several changes in the structure of Scott Kelly's eye and thickening of his retina suggested that, like about 40 per cent of astronauts, he experienced symptoms of"spaceflight-associated neuro-ocular syndrome".Scott Kelly also experienced some chromosomal instability that might reflect radiation exposure in space and although he aced cognitive tests in space, he slowed down after his return.
"It was a real privilege to be part of this study," said Scott Kelly, who retired from NASA soon after his return. Astronaut Scott Kelly has now spent more time in space than any other American. These are his best moments.As for trips to Mars, Mark Kelly said:"I hope it's sooner rather than later, and hopefully our participation in this study will help us get closer to making a mission like that a success."
"This is really going to help us learn a lot about the negative effects of space on our human physiology and then hopefully we'll figure out how to mitigate that," Scott Kelly said. The study was published in the journal Science on the 58th anniversary of the first manned spaceflight, by the Soviet Union's Yuri Gagarin.