Manned Maneuvering Unit

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Notion

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Science and technology

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What Wikipedia says

The Manned Maneuvering Unit (MMU) is an astronaut propulsion unit that was used by NASA on three Space Shuttle missions in 1984, STS-41-B, STS-41-C, and STS-51-A. The MMU allowed the astronauts to perform untethered extravehicular spacewalks at a distance from the shuttle.

Excerpt from the Wikipedia article “Manned Maneuvering Unit”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, Public domain, via Wikimedia Commons.