HOUSTON — Around-the-clock preparations were underway in NASA’s Mission Control on Aug. 2 for the first of two spacewalks over the next week to replace the International Space Station’s external cooling loop pump module that shut down over the weekend, triggering a power-down of two control moment gyroscopes and other space station subsystems. Station flight engineers Doug Wheelock and Tracy Caldwell Dyson are scheduled to float from the U.S. airlock on Thursday, Aug. 5, just before 7 ...


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