Time has run out for a NASA atomic clock experiment in space. <https://www.jpl.nasa.gov/news/working-overtime-nasas-deep-space-atomic-clock-completes-mission> JPL said it shut down the Deep Space Atomic Clock last month after running for more than double its planned one-year lifetime. The atomic clock, a payload on the Orbital Test Bed spacecraft launched on the STP-2 mission in June 2019, demonstrated the accuracy in timing needed to use it for deep space navigation. [NASA/JPL]

--Keith

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