Mission Specialists Piers Sellers and Mike Fossum completed the second spacewalk of space shuttle mission STS-121 on July 10, successfully restoring re-dundant command capability to the Inter-national Space Station's mobile transporter system. The astronauts replaced a reel assembly for a cable that provides power and data to the mobile transporter, a rail-mounted system that carries the station's 60-foot manipulator arm. The previous cable was inadvertently cut by a safing system in ...

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