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Watch Live: NASA Astronauts Perform Spacewalk

NASA astronauts Rick Mastracchio and Steve Swanson perform a spacewalk outside the ISS to replace a piece of equipment that controls several station systems.
International Space Station
In this handout from NASA, Japan Aerospace Exploration Agency astronaut Aki Hoshide, Expedition 32 flight engineer, participates in the mission?s third session of extravehicular activity (EVA outside the International Space Station September 5, 2012 in Space.
By MSNBC staff, MSNBC staff

NASA astronauts Rick Mastracchio and Steve Swanson perform a spacewalk outside the ISS to replace a  piece of equipment that controls several station systems.