View of the Shuttle Endeavour Payload Bay

S134-E-006505 (17 May 2011) --- The Orbiter Boom Sensor System (OBSS), pictured on the second flight day of STS-134, on left side of this photo showing Endeavour's vertical stabilizer and cargo bay, is a 50-foot boom carried onboard each of NASA's space shuttles. The boom can be grappled by the Canadarm and serves as an extension of the arm, doubling its length to a combined total of 100 feet (30 meters). At the far end of the boom is an instrumentation package of cameras and lasers used to scan the leading edges of the wings, the nose cap, and the crew compartment after each lift-off and before each landing. Photo credit: NASA