A test using atomic clocks will watch superpositions ride Earth’s curved space-time and see if Einstein can play nice with ...

Optical clocks are typically evaluated on two levels — accuracy (how close a clock comes to measuring the ideal “true” time, ...

Possibly originating with the English poet Geoffrey Chaucer's "time and tide wait for no man," the idea that time waits for ...

Physicists are rethinking time itself. Long treated as a basic part of the universe, time may instead be an illusion—a side ...

A clock built by a team led by researchers at the National Institute of Standards and Technology (NIST) has been estimated to ...