Space station astronauts Suni Williams and Aki Hoshide are working on one of today's major spacewalk tasks, replacing a Main Bus Switching Unit, one
of four such units that route power to parts of the space station.
Photo: Space station astronauts Suni Williams and Aki Hoshide are working on one of today's major spacewalk tasks, replacing a Main Bus Switching Unit, one of four such units that route power to parts of the space station.
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