NATIONAL  ·   April 23, 2014

NASA astronauts perform spacewalk outside ISS

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

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

NASA astronauts perform spacewalk outside ISS (1:37)

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