STS-119 will deliver the Starboard 6 truss segment, giving the station its fourth and final set of power-generating solar wings. The S6 truss, with its set of large U.S.-constructed solar arrays, will complete the backbone of the station and provide one-fourth of the total power needed to support a crew of six.
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FYI – this got postponed and is scheduled again for tonight at 8:54 PM ET