KENNEDY SPACE CENTER, FLA. -- Expedition 5 astronaut Peggy Whitson undergoes suit check as part of pre-launch activities. Part of Mission STS-111, Expedition 5 will travel to the International Space Station on Space Shuttle Endeavour as the replacement crew for Expedition 4, who will return to Earth aboard the orbiter. Known as Utilization Flight 2, Endeavour is carrying supplies and equipment to the Station. The payload includes the Multi-Purpose Logistics Module Leonardo, the Mobile Base System, which will be installed on the Mobile Transporter to complete the Canadian Mobile Servicing System, or MSS, and a replacement wrist/roll joint for Canadarm 2. The mechanical arm will then have the capability to "inchworm" from the U.S. Lab Destiny to the MSS and travel along the truss to work sites. Launch is scheduled for May 30, 2002 KSC-02pd0779

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KENNEDY SPACE CENTER, FLA. -- Expedition 5 astronaut Peggy Whitson undergoes suit check as part of pre-launch activities. Part of Mission STS-111, Expedition 5 will travel to the International Space Station on Space Shuttle Endeavour as the replacement crew for Expedition 4, who will return to Earth aboard the orbiter. Known as Utilization Flight 2, Endeavour is carrying supplies and equipment to the Station. The payload includes the Multi-Purpose Logistics Module Leonardo, the Mobile Base System, which will be installed on the Mobile Transporter to complete the Canadian Mobile Servicing System, or MSS, and a replacement wrist/roll joint for Canadarm 2. The mechanical arm will then have the capability to "inchworm" from the U.S. Lab Destiny to the MSS and travel along the truss to work sites. Launch is scheduled for May 30, 2002 KSC-02pd0779

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KENNEDY SPACE CENTER, FLA. -- Expedition 5 astronaut Peggy Whitson undergoes suit check as part of pre-launch activities. Part of Mission STS-111, Expedition 5 will travel to the International Space Station on Space Shuttle Endeavour as the replacement crew for Expedition 4, who will return to Earth aboard the orbiter. Known as Utilization Flight 2, Endeavour is carrying supplies and equipment to the Station. The payload includes the Multi-Purpose Logistics Module Leonardo, the Mobile Base System, which will be installed on the Mobile Transporter to complete the Canadian Mobile Servicing System, or MSS, and a replacement wrist/roll joint for Canadarm 2. The mechanical arm will then have the capability to "inchworm" from the U.S. Lab Destiny to the MSS and travel along the truss to work sites. Launch is scheduled for May 30, 2002

Space Shuttle Program

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.