PARIS — Europe’s comet-chasing Rosetta spacecraft emerged from 31 months of deep-space slumber Jan. 20 to reestablish communications with Earth. The €1.3 billion ($1.76 billion) European Space Agency (ESA) mission made contact with NASA’s 70-meter-dia. ground station at Goldstone, Calif., 48 min. into a nail-chewing hour-long window that opened at 12:30 p.m. eastern. The wakeup process began more than eight hours earlier, when Rosetta’s onboard “alarm clock” sounded at 5 a.m. ...

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