Spacewalk

STS-119 mission specialist Astronaut <a class="taxInlineTagLink" id="PEPLT000167" title="Richard Arnold" href="/topic/politics-government/richard-arnold-PEPLT000167.topic">Richard Arnold</a> participates in a six-hour spacewalk as construction and maintenance continue on the International Space Station on March 19. (Photo by <a class="taxInlineTagLink" id="ORGOV000098" title="NASA" href="/topic/science/space/nasa-ORGOV000098.topic">NASA</a> via <a class="taxInlineTagLink" id="ORCRP006499" title="Getty Images Inc." href="/topic/business/media-industry/getty-images-inc.-ORCRP006499.topic">Getty Images</a>)

STS-119 mission specialist Astronaut Richard Arnold participates in a six-hour spacewalk as construction and maintenance continue on the International Space Station on March 19. (Photo by NASA via Getty Images)

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