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FEATURED IMAGE
Testing at the Pad

Rotating Service Structure rolled back from Discovery The Rotating Service Structure is rolled back from around Space Shuttle Discovery at Launch Pad 39B for a propellant-loading test of Discovery's External Tank (ET) on April 14. During a tanking test, the tank is filled to launch levels with ultra-cold hydrogen and oxygen propellants, known as "cryogenics." The test is designed to evaluate how the tank, orbiter, Solid Rocket Boosters and ground systems are performing under full "cryo-load."

Image Credit: NASA/KSC

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