Powering Up the Station
During the STS-119 mission's first spacewalk, astronauts Richard Arnold and Steve Swanson (out of frame) connected bolts to permanently attach the S6 truss segment to S5. The spacewalkers plugged in power and data connectors to the truss, prepared a radiator to cool it, opened boxes containing the new solar arrays and deployed the Beta Gimbal Assemblies, containing masts that support the solar arrays.
Image Credit: NASA
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