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Atomic clocks

Space A beam of light can cross the entire universe in no time at all

A billion-year journey can contain zero elapsed time along a photon’s path through spacetime.

Innovations How did the first-ever clockmaker know what time to set?Joseph Shavit

Innovations Physicists use thorium-229 to power the world’s first working nuclear clock Joshua Shavit

Discoveries Atomic clocks may be powerful enough to detect the quantum fabric of time Shy Cohen

Discoveries Breakthrough ion clock experiments reveal that time can go quantum Shy Cohen

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