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Atomic clocks speed up

Atomic clocks speed up

The most successful applications of atomic clocks include the global positioning system (GPS) of satellites for navigation, and also the international basis of timekeeping, known as the coordinated universal timescale or UTC. Atomic clocks are also used in precision tests of fundamental theories, such as quantum electrodynamics and general relativity. Historically the increase in accuracy […]

When constants are not constant

When constants are not constant

In the movie The Meaning of Life, the Monty Python team reminds us that we live in “an amazing and expanding universe”. Ever since the startling evidence for cosmic expansion was discovered in the 1920s, physicists have considered the possibility that the so-called constants of nature – such as the charge on the electron and […]

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