STS-127 Work On The International Space Station

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