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KENNEDY SPACE CENTER, FLA. -- Across the expanse of the turn basin, Space Shuttle Atlantis is seen as it creeps toward Launch Pad 39A. At left is the 525-foot-tall Vehicle Assembly Building. First motion was at 8:19 a.m. The 3.4-mile trip along the crawlerway will take about 6 hours. The mission payload aboard Space Shuttle Atlantis is the S3/S4 integrated truss structure, along with a third set of solar arrays and batteries. The crew of six astronauts will install the truss to continue assembly of the International Space Station. Launch is targeted for March 15. Photo credit: NASA/Kim Shiflett