The most famous failed experiment in physics found exactly nothing
In 1887 two scientists tried to measure Earth's motion through the 'ether' — and the answer they got was zero.
Nineteenth-century physicists assumed light waves rippled through an invisible medium filling space, the luminiferous ether. If so, Earth’s motion through it should create an ether wind, making light travel slightly faster in one direction than another.
In 1887, Albert Michelson and Edward Morley built an exquisitely sensitive interferometer to catch that difference, splitting a light beam down two perpendicular paths and recombining it. They expected a tiny shift as they rotated the apparatus.
They found no difference. The speed of light was the same in every direction — a null result that quietly demolished the ether theory.
This ‘failure’ became one of the most productive experiments ever performed.
The puzzle it exposed helped clear the way for Einstein’s 1905 special relativity, which simply took the constancy of light’s speed as a starting law of nature.
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