Ed White using the Space Gun in 1965
The space gun was a hand-held Manned Maneuvering Unit used by American astronaut Ed White on the first spacewalk in 1965. The device used a pressurized oxygen jet to control and propel the astronaut via conservation of momentum.
The gun was described as easier to use than other methods of maneuvering during space-walking. It provided the impulse to leave the Gemini capsule, and was the easiest way to move in the microgravity environment, but quickly ran out of propellant, forcing White to use a tether to continue maneuvers.
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