I thought some more on the MM experiment. I have always postulated the existence of an aether. Note it is defined as a hypothetical medium that pervades all space. Hypothetical means assumed, It can have no defined material properties. Other than ELECTROMAGNETIC. That it provides a medium to conduct Electro magnetic radiation. As a non evident material thing one cannot even presume that it can move or flow in the material sense. (*qualification below) It is presumptive of the definer of this definition to say it pervades all space, giving it the dimension of infinity. It is more logical to say it pervades all of the created universe, which is finite. From the earth centre perspective, one could assume the possibility, that the aether rotates around the earh with the cosmos. That MM could not detect this movement simply means that they were wrong in assuming that the light beam would flow with the aether. What logical reason could they have for making such an assumption. They assumed that the aether had the same physical properties as a material fluid. On what grounds? NONE. In any case, light does not flow with the wind either ** One may possible theorise that the aether becomes physically and materially obstructive to any material that approaches the speed of light. Thus if the aether is rotating with the stars, around earth centre, out there many times the speed of light, then the stars will experience no obstruction in moving with it . It might in fact be but not necessarily so, that it is this aetheric pressure that carries the cosmos with it. . Just as good as the other theories anyway. And there is no known way of explaining the combined wave, corpuscular nature of Radio waves. Maxwell s equations not withstanding. His equations cannot have been solved or resolved, given the conventional controversy over them .. Philip.