Space History Photo: Carr and Pogue in Skylab

Two astronauts humorously demonstrate zero-gravity during the 1974 Skylab 4 mission. (Image credit: NASA)

In this historical photo from the U.S. space agency, Astronaut Gerald P. Carr, Commander for the Skylab 4 mission, jokingly demonstrates weight training in zero-gravity as he balances astronaut William R. Pogue, pilot, upside down on his finger.

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

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NASA Archives

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.