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NASA / Science Source
Photograph - Photograph
Astronaut Bruce McCandless II, one of two 41-B mission specialists, "spacewalking" a few meters from the Earth-orbiting space shuttle Challenger. The shuttle's cabin and open payload bay may be seen in the reflection from his gold-tinted visor. This historic extravehicular activity was the first to make use of a nitrogen-propelled hand-controlled device called the manned maneuvring unit (MMU). The unit allows for much greater mobility than that afforded to previous spacewalkers who had to use restrictive tethers.
February 19th, 2013
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