e/Timeline of luminiferous aether

Information
has gloss	eng: The timeline of luminiferous aether begins in the late 19th century with the concept of luminiferous aether ("light-bearing aether"), or ether, as a medium for electromagnetic propagation. The aether was assumed to exist for much of the 19th century -- until the Michelson-Morley experiment returned the famous "null result". Further experiments were in general agreement and by the 1920s the aether was mostly assumed not to exist.
lexicalization	eng: Timeline of Luminiferous Aether
instance of	e/Aether theories