Scientists propose using quantum-entangled clocks to test how gravity affects quantum mechanics in curved spacetime.

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

One of the biggest challenges in modern physics is uniting quantum mechanics and general relativity. A new experiment may ...

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

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

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