When his upcoming one-year stay aboard the International Space Station was first proposed, veteran NASA astronaut Scott Kelly was not all that interested. It was just a year after his March 2011 return from six months aboard the orbiting laboratory. "At first, I will be honest, I was not that interested because six months is a long time in space. A year is obviously twice as long," the retired 50-year-old U.S. Navy test pilot recalled during a Dec. 18 news briefing on the mission ...

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