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The First Human Satellite: Flying Free With the MMU

7 Feb 2015, 22:30 UTC
The First Human Satellite: Flying Free With the MMU
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31 years ago today, on Feb. 7, 1984, NASA astronaut Bruce McCandless II became the first “human satellite” when he tested the Manned Maneuvering Unit during STS-41B. Self-propelled via 24 small nitrogen-powered thrusters, the MMU allowed McCandless (who was instrumental in developing the Unit at Lockheed Martin) to travel tether-free through space. In the iconic photo […]

NASA astronaut Bruce McCandless II during his flight test of the Manned Maneuvering Unit (MMU) in February 1984 (NASA)
31 years ago today, on Feb. 7, 1984, NASA astronaut Bruce McCandless II became the first “human satellite” when he tested the Manned Maneuvering Unit during STS-41B. Self-propelled via 24 small nitrogen-powered thrusters, the MMU allowed McCandless (who was instrumental in developing the Unit at Lockheed Martin) to travel tether-free through space. In the iconic photo above McCandless is seen hovering against the blackness of space, 320 feet (98 meters) away from the Challenger orbiter.
A former U.S. Navy captain, McCandless was 46 years old when he performed his historic tether-free flight.

“May well have been one small step for Neil, but it’s a heck of a big leap for me!”
– STS-41B Mission Specialist Bruce McCandless II, Feb. 7, 1984

During the STS-41B ...

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