International Space Station program managers imposed power restrictions as they prepared a response to a failed attempt on Aug. 30 to replace a degraded Main Bus Switching Unit (MBSU) outside the six-person orbiting science laboratory during the first NASA-orchestrated spacewalk in 14 months. Mission planners juggled experiment schedules, with the exception of the high-priority work of the Alpha Magnetic Spectrometer, turned to manual rather than thermostat control of internal heaters, ...

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