On NASA Kennedy Space Center's Launch Pad 39A, workers check the fittings around space shuttle Endeavour's payload bay doors after closing. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the ELM-PS and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Dimitri Gerondidakis