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Gemini 6A closes to within 35 feet of its sister capsule, Gemini 7, on December 15, 1965. (NASA/JSC/ASU)

Gemini 6A closes to within 35 feet of its sister capsule, Gemini 7, on December 15, 1965. (NASA/JSC/ASU)

On June 5, 1966, Gemini 9A Commander Eugene Cernan spent more than 2 hours on a spacewalk, taking this photo while standing in the open hatch over the Pacific Ocean. (NASA/JSC/ASU

On June 5, 1966, Gemini 9A Commander Eugene Cernan spent more than 2 hours on a spacewalk, taking this photo while standing in the open hatch over the Pacific Ocean. (NASA/JSC/ASU

A screen printed poster of the Gemini Project Spacewalk [3000x2000] http://ift.tt/2mB06kQ

A screen printed poster of the Gemini Project Spacewalk [3000x2000] http://ift.tt/2mB06kQ

Astronaut Edward White floats in zero gravity of space northeast of Hawaii, during the first-ever spacewalk for an American, on June 3, 1965, during the flight of Gemini IV.

Astronaut Edward White floats in zero gravity of space northeast of Hawaii, during the first-ever spacewalk for an American, on June 3, 1965, during the flight of Gemini IV.

Gemini 6A approaches for the first manned rendezvous with another spacecraft, its sister Gemini 7, on December 15, 1965. (NASA/JSC/ASU)

Gemini 6A approaches for the first manned rendezvous with another spacecraft, its sister Gemini 7, on December 15, 1965. (NASA/JSC/ASU)

Remembering Project Gemini - The Atlantic A Gemini capsule being tested in Unitary Plan Wind Tunnel at NASA's Langley Research Center, on November 7, 1962.

Remembering Project Gemini - The Atlantic A Gemini capsule being tested in Unitary Plan Wind Tunnel at NASA's Langley Research Center, on November 7, 1962.