HOUSTON — NASA’s Dawn spacecraft is once again advancing closer to the large asteroid Ceres, following a 17-day hiatus during which ground controllers identified and responded to a mechanical issue with the gimbaling of the No. 3 ion propulsion engine. The suspension was lifted when it was determined that all of Dawn’s systems were functioning at an orbital altitude of 2,700 mi. with a work-around, according to a status report issued July 17 by NASA’s Jet Propulsion ...

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