KENNEDY SPACE CENTER, FLA. - A crack formed on a piece of insulation on a strut that attaches the liquid oxygen feedline to External Tank-119, being used to launch space shuttle mission STS-121. This piece of foam, weighing approximately 0.0057 pounds, is three inches long and one-eighth to one-quarter inch wide. It fell from the tank and was recovered by the Ice Team from the mobile launch platform at Pad 39B. It is believed that the rain experienced during yesterday’s launch attempt of Discovery caused water to run down the feedline and form ice near the strut next to the feedline bracket. As the tank warmed and expanded, the ice that formed most likely pinched the foam on the top of the strut, causing a crack and eventual loss of the small piece of foam. Photo credit: NASA KSC-06pd1384

The Space Shuttle program was the United States government's manned launch vehicle program from 1981 to 2011, administered by NASA and officially beginning in 1972. The Space Shuttle system—composed of an orbiter launched with two reusable solid rocket boosters and a disposable external fuel tank— carried up to eight astronauts and up to 50,000 lb (23,000 kg) of payload into low Earth orbit (LEO). When its mission was complete, the orbiter would re-enter the Earth's atmosphere and lands as a glider. Although the concept had been explored since the late 1960s, the program formally commenced in 1972 and was the focus of NASA's manned operations after the final Apollo and Skylab flights in the mid-1970s. It started with the launch of the first shuttle Columbia on April 12, 1981, on STS-1. and finished with its last mission, STS-135 flown by Atlantis, in July 2011.