First untethered space walk (7 feb 1984 año – 7 feb 1984 año)

Descripción:

Astronaut Bruce McCandless made history performing a spacewalk during STS-41B with no lifelines tethering him to space shuttle Challenger. Using the Manned Maneuvering Unit (MMU), McCandless and astronaut Bob Stewart completed separate untethered spacewalks during the mission, both venturing more than 300 feet/ 91 meters from Challenger.

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