This photo provided by NASA shows the International Space Station as seen from the Space Shuttle Atlantis after the station and shuttle began their post-undocking relative separation on May 23, 2010. Twenty years after the first crew arrived, the space station has hosted 241 residents and grown from three cramped and humid rooms to a complex almost as long as a football field, with six sleeping compartments, three toilets, a domed lookout and three high-tech labs. (NASA via AP)
The International Space Station. Astronauts were to remove a faulty electronics box from a communications antenna during their spacewalk. AP

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