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Michelson and Morley Experiment
Michelson and Morley fail to detect Earth's motion with respect to the Aether. -
Fitzgerald proposes his contraction theory
Fitzgerald proposed that length contraction could account for the null result of Aether motion experiments. -
Special Relativity Proposed
Albert Einstein publishes "On the Electrodynamics of Moving Bodies" where he proposes that previous experiments could be explained via all inertial observers seeing the same speed of light. -
4th dimension
Minkowski proposes the notion that relativity can be interpreted as time being a 4th dimension.