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The 1887 interferometer experiment found no ether-wind fringe shift of the expected magnitude, sharply constraining stationary luminiferous-ether models.
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The null result undermined simple stationary-ether models and became part of the experimental setting in which Lorentz invariance and special relativity were accepted; direct influence on Einstein’s 1905 reasoning remains historically uncertain.
The source experiment, observation, anomaly, or problem materially motivated the development, revision, or acceptance of the target concept. Historical influence is not logical derivation; the edge detail states the documented role and avoids retrospective origin myths.
wp-physics-michelson_morley_experimentaps-michelson-morley