I was a reasonably well-informed adult in the 1980's but I have absolutely no memory of this—the first untethered spacewalk in February 1984.
Bruce McCandless, an astronaut on the Space Shuttle Challenger, was using a Manned Maneuvering Unit (MMU), which used spurts of cold nitrogen gas to push him through space. He was able to move approximately 100 yards away from the shuttle and fly back again.
Image credit: NASA
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