Space shuttle Endeavour majestically awaits liftoff on Launch Pad 39A at NASA's Kennedy Space Center.

Space shuttle Endeavour majestically awaits liftoff on Launch Pad 39A at NASA's Kennedy Space Center in Florida. The rotating service structure (RSS) surrounds the shuttle for protection and to provide access but will be retracted before launch. Endeavour and its crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Launch is scheduled for April 29 at 3:47 p.m. EDT. This will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.htmlPhoto credit: NASA/Frank Michaux