Light exits in the crest of a wave and dark in the trough. Refraction is the bending of waves. The aether exists because something must transmit light. Postulates cannot be used to develop a theory. Length, mass, and time changes are just apparent.
Time is absolute.
Length and time only change for one observer. Time dilation refers to 2 clocks in 2 different frames. Time dilation and length contractions have not been proven in experiments. There exits a preferred frame of reference in the universe. A mass moving at the speed of light becomes energy.