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Associated Press
In this image from NASA television astronaut Terry Virts exits the Quest airlock hatch beginning the third spacewalk outside the International Space Station early Sunday morning March 1, 2015. Terry Virts and Butch Wilmore have 400 feet of cable and two antennas to install. Once that's complete, the spacewalkers will have routed nearly 800 feet of power and data lines, all of it needed for future American crew capsules. (AP Photo/NASA-TV)

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