Space shuttle Endeavour's main engines ignite for liftoff at Launch Pad 39A at NASA's Kennedy Space Center in Florida.
Endeavour began its final flight, the STS-134 mission to the International Space Station, at 8:56 a.m. EDT on May 16. Endeavour and its six-member crew will deliver the Alpha Magnetic Spectrometer-2 (AMS), Express Logistics Carrier-3, a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the space station. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Sandra Joseph and Kevin O'Connell