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September 4, 2015

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In this photo provided by the European Space Agency on Monday Jan. 20, 2014, technicians celebrate after receiving the Rosetta wake-up signal in the control room of ESA in Darmstadt, Germany.

Juergen Mai / ESA / Associated Press

In this photo provided by the European Space Agency on Monday Jan. 20, 2014, technicians celebrate after receiving the Rosetta wake-up signal in the control room of ESA in Darmstadt, Germany.