STS-119 was a Space Shuttle mission to the International Space Station (ISS) flown by Space Shuttle Discovery. The mission launched on March 15, 2009, and was the eighteenth shuttle mission to visit the ISS. The primary objective of the mission was to deliver and install the S6 (S-six) Truss, which would provide additional structural support and a mounting point for solar arrays, radiators, and other equipment on the ISS. The mission also included the delivery of supplies and equipment to the ISS and the rotation of the crew of the ISS.
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