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During the Space Shuttle Challenger mission STS-41-B, astronauts Bruce McCandless II and Robert L. Stewart performed the first untethered spacewalk (pictured).
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Space Shuttle Challenger
Space Shuttle orbiter (1983–1986)
Space Shuttle Challenger (OV-099) was a Space Shuttle orbiter manufactured by Rockwell International and operated by NASA. Named after the commanding ship of a nineteenth-century scientific expedition that traveled the world, Challenger was the second Space Shuttle orbiter to…Source: Wikipedia (CC BY-SA)
STS-41-B
1984 American crewed spaceflight
STS-41-B was NASA's tenth Space Shuttle mission and the fourth flight of the Space Shuttle Challenger. It launched on February 3, 1984 and landed on February 11, 1984, after deploying two communications satellites. It was also notable for including the first untethered spacewalk.Source: Wikipedia (CC BY-SA)
Bruce McCandless II
American aviator and astronaut (1937–2017)
Bruce McCandless II was an American Navy officer and aviator, electrical engineer, and NASA astronaut. In 1984, during the first of his two Space Shuttle missions, he completed the first untethered spacewalk by using the Manned Maneuvering Unit.Source: Wikipedia (CC BY-SA)
Robert L. Stewart
American brigadier general and astronaut (born 1942)
Robert Lee Stewart is an American retired military officer and NASA astronaut who was a brigadier general of the United States Army.Source: Wikipedia (CC BY-SA)
Extravehicular activity
Activity done by an astronaut or cosmonaut outside a spacecraft
Extravehicular activity (EVA) is any activity done by an astronaut in outer space outside a spacecraft. In the absence of a breathable Earthlike atmosphere, the astronaut is completely reliant on a space suit for environmental support. EVA includes spacewalks and lunar or…Source: Wikipedia (CC BY-SA)