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"The
Reduced-Gravity Program operated by the NASA Lyndon B. Program Johnson Space
Center (JSC) in Houston, Texas, provides the unique "weightless" or "zero-g"
environment of space flight for test and training purposes on a
cost-reimbursable funding basis. The Program was started in 1959 to
investigate human and hardware reactions to operating in a weightless
environment. The reduced-gravity environment is obtained with a specially
modified KC-1 35A turbojet transport which flies parabolic arcs to produce
weightless periods of 20 to 25 seconds. The KC-1 35A can also provide short
periods of lunar (1 /6) and Martian (1/3) gravity."
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