Space History Photo: Artificial Gravity Space Station

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A 1969 station concept designed to rotate on its central axis to produce artificial gravity. (Image credit: NASA.)

In this historic photo from the U.S. space agency is pictured a 1969 concept of a space station. The station was to rotate on its central axis to produce artificial gravity.

The majority of early space station concepts created artificial gravity one way or another in order to simulate a more natural or familiar environment for the health of the astronauts.

[Far Out Space Station Concepts by NASA (Gallery )]

After returning from the micro-gravity environment, astronauts find their muscles weak because they have not been using them. Long-term exposure to micro-gravity could generate long-term health problems for astronauts who do not utilize their muscles. This is why there are exercise machines on space shuttles and on the International Space Station. It was to be assembled on-orbit from spent Apollo program stages.

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

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U.S. Space Agency

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.