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  1. Measuring time to the thousand-billionth of a second

    Publishing date:

    June 29, 2010

    Since 7 June 2010, the Paris Observatory and Côte d’Azur Observatory have been firing lasers into space—more specifically at the T2L2 instrument on the Jason-2 satellite. The purpose of this experiment, coordinated by CNES, is to synchronize two remote clocks with unprecedented levels of precision.

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