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

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

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

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

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