Normally in explaining the aether model of light it is said that all waves need a medium, so just like sound uses air, light uses the aether. To my understanding sound can travel through gas, liquid and solids just fine without air being partially entrained in the materials. Sound does not use just one medium, why would light? Light can also travel through gas, liquid and solids and just like sound it will travel at different speeds through the different materials. In the Michelson and Morley experiment it was done in air, that was not moving relative to the equipment. I could ignore fact that the experiment was done in air if: air did not have a index of refraction, mirages didn't happen, and no there was no visual distortion between different temperatures of air. But it does and they do happen. Even if the experiment was done in a closed vessel under a vacuum, the equipment relative to that vacuum would not be moving. My question are: Isn't light clearly using air as a medium? why is the fact that the light that is traveling through a relative stationary medium is completely ignored? How can this experiment be translated into that the speed of light is constant in a vacuum?