The Orbiter Boom Sensor System (OBSS) can be seen on the left side of this view of Endeavour's vertical stabilizer and cargo bay in this photo provided by NASA and taken May 17, 2011. Space shuttle Endeavour reached the International Space Station on Wednesday to deliver a premiere science instrument and spare parts during NASA's next-to-last shuttle mission. The two-day trip to the orbital outpost ended at 6:14 am EDT as the shuttle and stationed soared 220 miles (350 km) northeast of Chile. [Photo/Agencies]
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