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(www.nasa.gov) - Astronaut Tom Marshburn performs his first spacewalk and the STS-127 crew's second of the five scheduled to continue work on the International Space Station. Astronauts Marshburn and Dave Wolf (out of frame) successfully transferred a spare KU-band antenna to long-term storage on the space station, along with a backup coolant system pump module and a spare drive motor for the station's robot arm transporter.  

spacewalk 

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