Space station astronauts stepped out on an urgent spacewalk Wednesday to replace a computer that failed nearly two weeks ago. Americans Rick Mastracchio and Steven Swanson successfully installed bolts... more 
Space station astronauts stepped out on an urgent spacewalk Wednesday to replace a computer that failed nearly two weeks ago. Americans Rick Mastracchio and Steven Swanson successfully installed bolts for a new computer that is a critical backup outside the International Space Station. less 
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Wed, Apr 23, 2014 12:46 PM EDT