Preview STS-41-B, First Untethered Spacewalk, 1984 Image ID: 1349-264 Artist: NASA Purchase a commercial license Buy framed prints & more from our print store 1980s 1984 20th century astronaut bruce mccandless challenger distance distant earth eva first untethered spacewalk floating isolated isolation manned maneuvering unit mccandless mmu nasa person space shuttle spacewalk sts 41b sts 41 b untethered