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This nadir view of the STS-117 mission Space Shuttle Atlantis, taken by the Expedition 15 crew aboard the International Space Station (ISS), occurred just before the two spacecraft linked up in Earth orbit. Berthed in the cargo bay are the 17.8 ton second and third (S3 and S4) truss segments ready for installment. STS-117 mission objectives included the addition of S3 and S4 with Photovoltaic Radiator (PVR), the deployment of the third set of solar arrays, and the retraction of the P4 starboard solar array wing and one radiator.