The speed of light was a mystery for millennia, a fugitive constant that escaped measurement and understanding. Now among the ...

Black hole and Big Bang singularities break our best theory of gravity. A trilogy of theorems hints that physicists must go ...

The National Institute of Standards and Technology (NIST) has dramatically enhanced the precision of time measurement with ...

A new atomic clock at the National Institute of Standards and Technology in Boulder is helping researchers count seconds to ...

From space, the Atomic Clock Ensemble in Space will link to some of the most accurate clocks on Earth to create a ...

The European Space Agency’s ACES mission could ultimately pave the way for a global network of atomic clocks that make these ...

A particle that lacks the energy to climb a barrier can still appear on the far side, a curiosity known as “quantum tunneling.” ...

NASA is creating Coordinated Lunar Time (LTC), the Moon’s first official time zone, to solve relativity challenges and synchronize future missions, navigation, and survival.

The package includes two extremely accurate atomic clocks – a caesium fountain clock and a hydrogen ... Second, ACES timekeeping comparisons will allow us to test Einstein's general theory of ...

General relativity explains that time also slows ... which will then be matched against ground-based atomic clocks to catch even the tiniest drift. The most precise timekeepers ever built are ...

The main aim is to test Einstein’s special relativity and general relativity ... This is not an effect that is appreciable by us, but for atomic clocks, it is. The times measured on the ground ...

The European Space Agency (ESA) is getting ready for the launch of an atomic clock system that aims to validate elements of Einstein’s theory of general relativity but could have implications ...