 Hughes–Drever experiment

The Hughes–Drever experiment, conducted in the 1950s by physicists Herbert Hughes and David Drever, was designed to test the isotropy of space-time and the validity of Lorentz invariance, which is a key principle of Einstein's theory of relativity. The experiment aimed to investigate whether physical laws, including the behavior of light, would remain the same regardless of the orientation or motion of the experimental apparatus in relation to the Earth's motion through space.