On Launch Pad 39A at NASA's Kennedy Space Center in Florida workers keep watch.

On Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers keep watch as space shuttle Endeavour's payload bay doors close. 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