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Artist Concept of J-2X Engine
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Artist Concept of J-2X Engine

July 2, 2009
The J-2X engine will power the upper stages of the Ares I and Ares V launch vehicles. Ares I is an in-line, two-stage rocket that will transport the Orion crew exploration vehicle to low Earth orbit. Ares V will enable NASA to launch a variety of science and exploration payloads, as well as key components needed to go to the moon and later to Mars. The J-2X upper stage engine is managed by NASA's Marshall Space Flight Center in Huntsville, Ala., for NASA's Constellation Program.