SR1: The Light that will Light the Spark - The Michelson-Morley Experiment
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Neil deGrasse Tyson explains the Michelson-Morley experiment excerpt from UNDAUNTED
American physicist Albert A. Michelson is most known for his measurements of the speed of light. In his time it was supposed to travel in the aether, strange hypothetical undetectable medium. Michelson’s work showed that the aether does not exist. This opened the door for the theory of relativity.