Astronauts Mike Fincke, left, and Greg Chamitoff, make their way along the P3 Truss on the International Space Station as they make their way back to the quest airlock wrapping up the fourth spacewalk Friday morning, May 27, 2011. This is the final spacewalk to be performed by shuttle crew astronauts. All future spacewalks _ including one during the final shuttle voyage this summer _ will be performed by full-time space station residents. (AP Photo/NASA)
Read the article: Last shuttle spacewalkers make history above Earth
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