Strutt's experiments

Strutt's experiments, conducted with light and mirror setups, aimed to detect the Earth's motion through the "aether," a hypothetical medium for light waves. He used an interferometer to compare the speed of light in different directions, expecting to see shifts if Earth moved through the aether. The results showed no such variation, indicating that the speed of light is constant regardless of Earth's movement. These experiments provided strong evidence against the aether theory and supported the development of Einstein's theory of special relativity, which posits that the speed of light is always constant in a vacuum.