Lorentz transformations were first proposed to scale from this substance's "rest system" to a "moving system.
This substance's namesake "drag theory" gained support in the Fizeau experiment. Lorentz transformations were first proposed to scale from this substance's "rest system" to a "moving system." The existence of this substance was discredited by the null result of the Michelson-Morley experiment. For 10 points, name this now-discredited theoretical substance that was thought to be the medium that carries light.
This substance's namesake "drag theory" gained support in the Fizeau experiment.
{luminiferous ether} [or {aether}]