KENNEDY SPACE CENTER, FLA. -- The U.S. Node 2 module, known as Harmony, is lowered into the waiting payload canister in the Space Station Processing Facility. The canister will deliver Harmony to Launch Pad 39A for installation into space shuttle Discovery's payload bay. The Italian-built module is about 21 feet long and 14 feet in diameter. The pressurized module will act as an internal connecting port and passageway to additional international science labs and cargo spacecraft. In addition to increasing the living and working space inside the station, it also will serve as a work platform outside for the station's robotic arm. Harmony will be installed on the station during mission STS-120, targeted to launch Oct. 23. Photo credit: NASA/Amanda Diller KSC-07pd2530

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.