HOUSTON — The six-person International Space Station is headed toward a resumption of normal operations following a pair of unscheduled late-December spacewalks by NASA astronauts to replace a degraded external thermal control system (TCS) pump module. The astronauts followed the excursions with other measures to restore cooling to all U.S. segment electrical systems deactivated in response to a Dec. 11 flow control valve failure. The last of the electrical loads – all in the ...

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