tethered space walk" were NASA astronauts Bruce McCandless and Robert Stewart during Space Shuttle mission 41-B in 1984. McCandless, pictured above, used a Manned Maneuvering Unit (MMU) to move in and around the cargo bay of the space shuttle. The MMU works by shooting jets of nitrogen and has since been used to help deploy and retrieve satellites. On Earth, an MMU weighs over 140 kilograms, but, like everything, is weightless in space. The MMU was replaced in 2001 with the SAFER backpack propulsion unit.
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A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture Of the Day
Publications with keywords: space walk
Publications with words: space walk