ASSOCIATED PRESS Astronauts Ronald Garan Jr. (top) and Michael Fossum work outside the International Space Station during the last spacewalk of NASA's space- shuttle era on Tuesday. They retrieved a broken ammonia pump.
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ASSOCIATED PRESS Astronauts Ronald Garan Jr. (top) and Michael Fossum work outside the International Space Station during the last spacewalk of NASA's space- shuttle era on Tuesday. They retrieved a broken ammonia pump.
