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CAPE CANAVERAL, Fla. – Steep ladders mounted to opposing sides of the interior wall of the upper stage simulator of the Ares I-X rocket provide the only access inside the vehicle for the installation of instruments and equipment. Part of the Constellation Program, the Ares I-X is the test vehicle for the Ares I, which is the essential core of a space transportation system designed to carry crewed missions back to the moon, on to Mars and out into the solar system. The Ares I-X flight test is targeted for Oct. 27. For information on the Ares I-X vehicle and flight test, visit http://www.nasa.gov/mission_pages/constellation/ares/flighttests/aresIx/index.html. Photo credit: NASA/Glenn Benson