NASA Space Shuttle launch stackNASA Space Shuttle launch stack display model. The Space Transportation System, commonly referred to as the Shuttle, consists of the Orbiter, the Solid Rocket Boosters (SRB), and the External Tank. The Orbiter and SRBs are reusable. The entire stack is 184 feet tall and weighs approximately 4. 5 million pounds. The Space Shuttle is launched in an upright position, with thrust provided by the three Space Shuttle main engines and the two SRBs. About 2
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