On February 7, 1984, NASA astronauts Bruce McCandless II and Robert L. Stewart made history by completing the first untethered spacewalk. The two men used jet-propelled backpacks called Manned Maneuvering Units (MMUs) to float freely in space, without being attached to the space shuttle. This groundbreaking achievement paved the way for future spacewalks and demonstrated the capabilities of human spaceflight.

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