On Launch Pad 39A at NASA's Kennedy Space Center in Florida workers examine.

On Launch Pad 39A at NASA's Kennedy Space Center in Florida, workers examine the ground umbilical carrier plate (GUCP). A hydrogen gas leak at that location on the external fuel tank during tanking for space shuttle Discovery's STS-133 mission to the International Space Station caused the launch attempt to be scrubbed Nov. 5. The GUCP will be examined to determine the cause of the hydrogen leak and then repaired. The GUCP is the overboard vent to the pad and the flame stack where the excess hydrogen is burned off.

For more information on STS-133, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts133/. Photo credit: NASA/Dimitri Gerondidakis