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S127-E-008456 (24 July 2009) --- Astronauts Tom Marshburn (right) and Christopher Cassidy, mission specialists for STS-127, share duties on the fourth spacewalk of Endeavour's current mission and its crew's joint activities with the space station. Eleven astronauts and cosmonauts remained inside the International Space Station and the shuttle to which it was docked, while the two continued work on the orbital outpost. The two will team up for the mission's final spacewalk on July 27.
