New Atomic Clock Could Be Accurate for 300 Million Years

U.S. researchers have launched a new atomic clock they say will neither gain nor lose a second in 300 million years.   The clock, called NIST-F2, will serve “new U.S. civilian time and frequency standard,” researchers at the U.S. National Institutes of Standards and Technology (NIST) in Colorado said. The current standard has been set by NIST-F1 since 1999.   Both clocks use what researchers call a  "fountain" of cesium atoms to come up with a precise measurement...

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