Sharon Christa McAuliffe, a teacher-citizen observer on STS-51L, smiles before participating in some zero-G rehearsals for her upcoming flight. She is seated near the controls of the KC-135 aircraft, flying for the Johnson Space Center from Ellington Air Field. Referred to as the "zero-gravity" aircraft, the KC-135 provides brief moments of weightlessness for shuttle crew members in training.
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Sharon Christa McAuliffe, a teacher-citizen observer on STS-51L, smiles before participating in some zero-G rehearsals for her upcoming flight. She is seated near the controls of the KC-135 aircraft, flying for the Johnson Space Center from Ellington Air Field. Referred to as the "zero-gravity" aircraft, the KC-135 provides brief moments of weightlessness for shuttle crew members in training.