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FILE - This image provided by the European Space Agency ESA shows an artist s impression of the Rosetta orbiter deploying the Philae lander to comet 67P/Churyumov Gerasimenko. The image is not to scale; the Rosetta spacecraft measures 32 m across including the solar arrays, while the comet nucleus is thought to be about 4 km wide. Scientists at the European Space Agency are expecting their comet-chasing probe Rosetta to wake from almost three years of hibernation at 11 a.m. Monday Jan. 20, 2014 (1000 GMT; 5 a.m. EST) and phone home to say all is well.
BERLIN—Scientists at the European Space Agency are expecting an important call.

Their comet-chasing probe Rosetta is due to wake from an almost three-year hibernation at 11 a.m. Monday (1000 GMT; 5 a.m. EST) and phone home to say all is well.

But because the spacecraft's systems will take hours to power up and the signal has to travel more than 800 million kilometers (500 million miles) back to Earth, the first sign of life isn't expected before early evening.

The agency is turning the tense wait into a social media event by encouraging space enthusiasts to "Wake up Rosetta" in case its internal alarm clock fails.

The probe will rendezvous with comet 67P/Churyumov-Gerasimenko in the coming months and drop a space lander onto its icy surface in November.

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http://www.esa.int/rosetta


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