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Ancient and medieval: the material that fills the region of the universe above the terrestrial sphere.
1670s, Newton
Huygens, wave theory of light
(transverse, instead of longitudinal)
Replaced by Maxwell, Einstein, Broglie: rejected the existence and necessity of aether
Michilson-morley experiment, evidence of aether is absent
Einstein: his model could itself be thought of as an aether
Early modern aether model be superseded, but some try to reintroduce aether to address deficiencies
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