According to Wikipedia (Michelson-Morley) physics theories of the 19th century "assumed that just as surface water waves must have an intervening substance...in this case water), and audible sound requires a medium to transmit its wave motions (such as air or water), so light must also require a medium (the 'luminiferous aether')." If aether existed, it was argued by Michelson and Morley, then it should exert a measurable if small effect. These two researchers attempted to measure the effect ...
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