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    NASA astronauts perform spacewalk outside the International Space Station

    NASA Astronauts Steve Swanson and Rick Mastracchio perform a spacewalk outside the International Space Station (ISS) to replace equipment.

    http://www.thv11.com/video/3501767634001/1/NASA-astronauts-perform-spacewalk-outside-the-International-Space-Station http://cdn.newslook.com/ad/adaf9a6b2b48c6d91b34e91c82cf9755/images/frame_ext.jpg NASA astronauts perform spacewalk outside the International Space Station NASA Astronauts Steve Swanson and Rick Mastracchio perform a spacewalk outside the International Space Station (ISS) to replace equipment. technologynewslookrick mastracchioWorldscience 01:37

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