Bruce McCandless and the Manned Maneuvering Unit (MMU)
On February 7, 1984 during Space Shuttle mission STS 41-B, astronaut Bruce McCandless made the first untethered spacewalk as he flew some 300 feet from the Shuttle in the first test of the MMU. This image was taken several days later on February 11.
Image Number: S84-27017
Credit: NASA
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