In the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, external fuel tank, ET-122, for space shuttle Endeavour's STS-134 mission is being lowered toward the twin solid rocket boosters. When lowered in place, the tank will be attached to the boosters on the mobile launcher platform. Endeavour and its crew will deliver the Express Logistics Carrier-3 and the Alpha Magnetic Spectrometer to the International Space Station. Launch is targeted for April 19. For more information visit, http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jack Pfaller