Postscript:

     Relativity theory's "constant speed of light postulate" and Premise I of the quantum medium view reflect very different assumptions about nature. The former says that photons reaching us from a star always have the same, constant speed in our reference frame, regardless of our velocity through the universe. While this assumption is consistent with experimental evidence, it is also inexplicable. The consequences of this assumption are also inexplicable, and require reconfiguring the "Galilean and Newtonian" cosmos into a universe devoid of time, distance and mass on which observers in different reference frames can agree.
     Premise I is also consistent with experimental evidence, and indirect evidence suggests the existence of a quantum medium through which photons are propagated. The fact that we do not now know what a photon is or how a photon is transmitted from one body to another indicates that important hidden phenomena exist at the quantum level of matter. Is it not likely that this hidden phenomena includes a medium because a medium provides a basis for explaining a wide range of perplexing observed phenomena, including relativistic phenomena?
     The likelihood of Premise I and the quantum medium view being in accordance with how our universe works will become clearer in the future. I would be grateful to the reader for any comments or information bearing on this likelihood. Thank you for your consideration of the quantum medium view.