Space History Photo: Gemini 4 Recovery with Green Marker Dye

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The Gemini 4 spacecraft awaits recovery in 1965 with the green marker dye coloring the ocean water. (Image credit: NASA)

In this historical photo from the U.S. space agency, an overhead view of the Gemini 4 spacecraft shows the yellow flotation collar used to stabilize the spacecraft in choppy seas. The green marker dye is highly visible from the air and is used as a locating aid.

A crewmember is being hoisted aboard a U.S. Navy helicopter during recovery operations following the successful four-day, 62 revolution mission highlighted by Ed White's space walk.

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.