A worker keeps watch as the portside payload bay door closes over space shuttle Endeavour's payload.

On Launch Pad 39A at NASA's Kennedy Space Center in Florida, a worker keeps watch as the portside payload bay door closes over space shuttle Endeavour's payload. Inside are the Integrated Cargo Carrier-Vertical Light Deploy, the Experiment Logistics Module-Exposed Section and the Japanese Experiment Module's Exposed Facility. The STS-127 mission is the final of three flights dedicated to the assembly of the Japanese Kibo laboratory complex on the International Space Station. Photo credit: NASA/Jack Pfaller