NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Astronaut Charles J. Camarda, STS-114 mission specialist, participating in Return to Flight training aboard NASAs KC-135 aircraft. The aircraft, based at Ellington Field near Johnson Space Center (JSC), flies a series of parabolic patterns over the Gulf of Mexico to allow astronauts and investigators to experience brief periods of weightlessness.
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