Scientists in the U.S. have built the most accurate clock in the world—so precise it can measure time down to 19 decimal ...

Jacobson/NIST After two decades of tinkering, scientists at NIST have unveiled the world’s most accurate atomic clock, a ...

Einstein’s theory of relativity shows us that time isn’t constant,it stretches or contracts based on speed and gravity. But ...

The 54-pound NWA 16788 has set a new world record as the most valuable meteorite ever sold at auction. The first major ...

The mind-bending concept of time dilation results from a seemingly harmless assumption—that the speed of light is the same for all observers.

If, like me, you can't go a day without making sure your watch is synced to the second, you'll be delighted to learn that a ...

The nodes in a quantum network don’t necessarily have to be computers; they can also be atomic clocks. The cesium atoms that ...

In this work, a rubidium fountain clock through an 84km commercial optical fiber link was used to steer the atomic time scale generated by a clock ensemble with 2 hydrogen masers and 8 high ...

Global positioning systems that support mapping programs are a prime example of how basic science can lead to unforeseen but ...

We report on the development of a long-term laser diode aging test bench that measures the spectral behavior of laser diodes over several years, in view of their applications in space Rb atomic clocks ...

Special relativity teaches us that there is no invariant total ordering of events in space-time; different observers can disagree about which of two events happened first. There is only a partial ...

Earth’s spin is speeding up, making our days shorter. Scientists warn of a possible “negative leap second” to keep clocks aligned—threatening tech, GPS, and time standards.