An atomic clock measured how general relativity warps time across a millimeter The record-breaking result reveals the incredible precision achievable by atomic clocks ...

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

An atomic clock that sets the time by the teensy oscillations of strontium atoms has gotten so precise and stable that it will neither gain nor lose a second for the next 15 billion years.

Setting the time on a clock is easy – unless it’s one of the most accurate in the world. Now a light signal sent between two German cities has set a new record for the transmission of an ...

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