Astronaut Bruce McCandless II, performs a spacewalk a few meters away from the cabin of the Earth-orbiting space shuttle Challenger, using a nitrogen-propelled Manned Maneuvering Unit, Feb. 7, 1984. (NASA via AP) ** FILE **
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Astronaut Bruce McCandless II, performs a spacewalk a few meters away from the cabin of the Earth-orbiting space shuttle Challenger, using a nitrogen-propelled Manned Maneuvering Unit, Feb. 7, 1984. (NASA via AP) ** FILE **
