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July 12, 2012
S135-E-006361 (9 July 2011) --- One of the four STS-135 crewmembers took this photo from space shuttle Atlantis' aft flight deck during the mission's second day of activities in Earth orbit. Earth's horizon and aft sections of the shuttle frame the orbiter boom sensor system (OBSS) on the starboard side of the spacecraft shortly before it was remotely maneuvered into position to start survey of the spacecraft's thermal protection system (TPS). The various sensor packages on the OBSS, which include a high-resolution still camera, a laser range imager and a video camera, later swept over the critical surfaces of the TPS, looking for signs of any damage that might have been caused by ascent debris or anything that might endanger the shuttle's ability to return to Earth safely. Photo credit: NASA

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