In this Feb photograph of the first untethered spacewalk NASA astronaut Bruce McCandless is in the midst of the first field tryout of a nitrogen-propelled backpack device called the Manned Maneuvering Unit MMU

Tags: space, photograph, untethered, spacewalk, nasa, astronaut, bruce, mccandless, midst, field, tryout, nitrogen-propelled, backpack, device, called, manned, maneuvering, unit

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