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Space History Photo: Astronauts Experience Weightlessness in the KC-135

space history, KC-135, astronauts, vomit comet
Six astronauts get to experience weightlessness on the KC-135. (Image credit: NASA.)

In this 1978 photo from the U.S. space agency, six astronauts who had been in training at the Johnson Space Center for almost a year are getting a sample of weightlessness. They are onboard the NASA KC-135 that uses a special parabolic pattern to create brief periods of microgravity, affording astronauts and astronaut candidates a preview of spaceflight.

These flights are nicknamed the "vomit comet" because of the nausea that is often induced.

The photo should be viewed with feet at the top. The three astronauts in the foreground are (left to right): Richard O. Covey, Steven R. Nagal and George D. Nelson. In the center background is Robert L. Stewart. Obscured in the background are Norman E. Thagard and Ellison S. Onizuka.

Each weekday, SPACE.com looks back at the history of spaceflight through photos (archive).

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The National Aeronautics and Space Administration (NASA) is the U.S. government agency in charge of the civilian space program as well as aeronautics and aerospace research. Founded in 1958, NASA is a civilian space agency aimed at exploring the universe with space telescopes,  satellites, robotic spacecraft, astronauts and more. The space agency has 10 major centers based across the U.S. and launches robotic and crewed missions from the Kennedy Space Center in Cape Canaveral Florida. It's astronaut corps is based at the Johnson Space Center in Houston. To follow NASA's latest mission, follow the space agency on Twitter or any other social channel, of visit: nasa.gov