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The luminiferous aether

Albert A. MichelsonEdward W. MorleyHendrik Lorentz

This page delivers no verdict; it presents claims and evidence with their sources. No theory in science is absolute. Method

For everyone

In the 19th century light waves were thought to travel through a space-filling medium called the "aether", just as sound travels through air. The 1887 Michelson–Morley experiment could not detect Earth's motion through this medium. Special relativity does not need an aether. Some physicists have nevertheless continued to discuss aether-like concepts in various forms.

For specialists

The Michelson–Morley interferometer looked for a fringe shift of about 0.4 expected from the aether wind; the shift observed was less than 1% of that. Lorentz and FitzGerald tried to preserve the aether with the length-contraction hypothesis. Lorentz aether theory makes predictions experimentally indistinguishable from special relativity but assumes an unobservable preferred frame. Modern tests of Lorentz violation (e.g. the Standard-Model Extension) have pushed limits to the 10⁻¹⁸ level.

Claims

Evidence

Supporting

Theoretical argument

Lorentz's length contraction and local time reconciled the aether with the null result; this theory makes the same observable predictions as special relativity.[2]

Challenging

Experiment

The Michelson–Morley experiment found no interference shift from Earth's motion relative to the aether.[1]

Measurement

Present-day tests of Lorentz symmetry find the effects of a preferred frame to be below very small limits.[3]

Connections

Parent

Physics

Its place (in wide use) was taken by

Special relativity

Related

Maxwell's equations and light

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Sources

  1. ArticleMichelson, A. A.; Morley, E. W. (1887). On the relative motion of the Earth and the luminiferous ether. American Journal of Science 34, 333–345DOI 10.2475/ajs.s3-34.203.333archive
  2. BookWhittaker, E. T. (1910). A History of the Theories of Aether and Electricity. Longmans, Green and Co., London
  3. ArticleKostelecký, V. A.; Russell, N. (2011). Data tables for Lorentz and CPT violation. Reviews of Modern Physics 83, 11–31DOI 10.1103/RevModPhys.83.11archive

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Cite this page

APA

Athena contributors. (2026). The luminiferous aether. Athena: The tree of human knowledge. Retrieved November 1, 2026, from https://latifkedi.github.io/athena/en/d/eter/

BibTeX
@misc{athena_eter,
  title        = {The luminiferous aether},
  author       = {{Athena contributors}},
  year         = {2026},
  howpublished = {\url{https://latifkedi.github.io/athena/en/d/eter/}},
  note         = {Athena: The tree of human knowledge. Accessed: 2026-11-01}
}

Added: September 27, 2026 · Last changed: September 27, 2026 · Page history

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