When a wave pulse encounters a change in the density of a medium some of the energy of the pulse is transmitted and some of it is reflected.
Suppose it is possible for a wave pulse to partially self-reflect by inducing a local change in the density of the medium as it travels through it. If this is possible then the difference between the cosmic microwave background (CMB) and the Hubble redshift would literally be a function of perspective. The CMB would be the reflected energy from our own local emanations, and the Hubble red shifted light from a distant galaxy would represent the energy lost as it is reflected back to the originating galaxy on its journey to us. This would mean the CMB is not an echo of the entire universe as it was in the past according to the expanding universe hypothesis. Rather the CMB contains a historical sequence of echoes from _our part_ of the universe. (I know the theory of special relativity says there is no need for light to have a medium or an aether, but then again no one has looked for reflections from an aether. Also reflections from the aether would not result in blurry images as is the case when the Hubble redshift is explained as light scattering off particles) Harry
