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Space Station Astronauts Tackle Radiator Problems

NASA astronaut Scott Kelly is back outside the International Space station for some radiator work. It's the second spacewalk in 1½ weeks for Kelly, who is more than halfway through a one-year flight, and fellow U.S. astronaut Kjell Lindgren. They got started an hour early. (Watch the spacewalk live on NASA's website.) Friday's excursion involves work on the space station's cooling system. The spacewalkers need to undo repairs made to a leaky cooling line a few...

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