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Aether
Luminiferous aether (or ether) was a hypothetical medium for the propagation of light.
Explanation
The special theory of relativity describes that light is a form of electromagnetic radiation that does not need a medium.
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Luminiferous aether (or ether) was a hypothetical medium for the propagation of light.
The special theory of relativity describes that light is a form of electromagnetic radiation that does not need a medium.