The new clock is so reliable that it would be off by less than a second if it had started running 100 million years ago, ...

Based on the rising and falling of cesium atoms under a microwave beam, the NIST-F4 atomic clock is so reliable that if it had started to run when dinosaurs existed 100 million years ago it would ...

We normally think of atomic clocks ... state of a stationary cesium-133 atom at a temperature of 0K. But there is a move to replace that definition using optical clocks that are 100 times more ...

Cesium fountain clocks such as NIST-F4 are a type of atomic clock—a complex, high-precision device that extracts timing pulses from atoms. These clocks play a critical role in our globally ...

Whether you find yourself glancing at a clock on the wall or checking your phone, the time you constantly see is the product of a meticulous system upheld by the world’s timekeepers. In the U.S., a ...

Cesium fountain clocks such as NIST-F4 are a type of atomic clock – a complex, high-precision device that extracts timing pulses from atoms. These clocks play a critical role in our globally connected ...