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"The Space Shuttle Main Engine.
Three space shuttle main engines power the space shuttle orbiter, NASA's Marshall Space Flight Center manages all shuttle propulsion elements, including the space shuttle main engines. NASA engineers have continually upgraded and refined the engines during the lifetime of the shuttle fleet. Most recently, Marshall unveiled the stronger, more durable, more efficient Block II space shuttle main engine, which first flew on the STS-104 in 2001." NASA sign at site
Source: Deane K. Dayton
Date: 2011
Rights: Deane K. Dayton