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In Orbiter Processing Facility bay 1 at NASAs Kennedy Space Center, Atlantis payload bay doors are open. The Remote Manipulator System, or Shuttle arm, is seen on the port side (top) and Orbiter Boom Sensor System (OBSS) is seen on the starboard side (lower) of the payload bay. The 50-foot-long OBSS attaches to the Shuttle arm and is one of the new safety measures for Return to Flight. It equips the orbiter with cameras and laser systems to inspect the Shuttles Thermal Protection System while in space. Mission STS-121 is targeted for launch in September. Once Atlantis' bay doors are open again, further work will be done in the bay.