S135-E-007439 (11 July 2011) --- NASA astronaut Doug Hurley, STS-135 pilot, moves around supplies and equipment in the Leonardo Permanent Multipurpose Module (PMM) during the fourth day of flight for Atlantis' four person crew. This module is a component that joined the International Space Station complex after it was flown into space aboard the space shuttle Discovery on STS-133. Photo credit: NASA
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