A new Air Force project aims to replace vulnerable satellite signals with atomic clock technology for next-generation drone ...

Learn about NIST-F4, the latest cesium fountain clock that now stands as one of the most accurate timekeepers in the entire world.

NIST scientists have published results establishing a new atomic clock, NIST-F4, as one of the world’s most accurate timekeepers, priming the clock to be recognized as a primary frequency ...

After 78 years, the Doomsday Clock has been set closer than it has ever been. As a global society, we are now only 89 seconds to midnight after scientists moved the clock’s hand one second ...

Time dilation, a captivating concept embedded in Einstein’s theory of relativity, has been experimentally validated on Earth.

According to scientists at NIST in Boulder, their newest atomic clock, the NIST-F4, will help track time more precisely and help put global time on a more accurate frequency.

The Doomsday Clock has been set to its closest time to midnight in its history, the Bulletin of the Atomic Scientists announced Tuesday.

Atomic clocks rely on the steady frequency at which electrons in atoms transition between energy levels. Keeping a count of these oscillations allows atomic clocks to measure time with extremely ...

Atomic clocks record time using microwaves at a frequency matched to electron transitions in certain atoms. They are the basis upon which a second is defined. But there is a new kid on the block ...

For decades, experts turned to cesium atomic clocks as the most precise time keepers, but technological advances are helping usher in a new timekeeping device reliant on more stable aluminum ions.

Atomic clocks use quantum physics and the resonant frequency of atoms, like cesium, to define time.