The Experiment That Changed Everything
The Michelson and Morley Experiment: Disproving the Aether and Shaping Modern Physics In the annals of scientific discovery, few experiments have had as profound an impact on our understanding of the universe as the Michelson and Morley experiment. Conducted in 1887 by American physicists Albert A. Michelson and Edward W. Morley, the experiment was originally intended to detect the motion of the Earth through the “luminiferous aether.” Instead, it produced a null result—seemingly confirming nothing at all. And yet, that nothing changed everything. It marked the downfall of the aether theory and helped lay the groundwork for Einstein's theory of special relativity, fundamentally altering the trajectory of modern physics. Background: The Aether Theory During the 19th century, the wave theory of light had gained widespread acceptance among scientists. Waves, as then understood, required a medium to propagate—like sound through air or ripples across water. Since light could travel th...