Wetterich's steady state universe and increasing density of matter
Perhaps this is a different way of looking at the Universe. No it is not expanding rather its composite stuff is getting denser as time passes. All spectra are getting more blue-shifted as time ticks on. We get this from Plank's equation that equates mass-energy with wave packets of frequency in proportion to the energy. Less mass in the past associated to 'stuff' means slower ticking of clocks. As such galaxies appear red-shifted as they are distant and so in the past. Does this explain Olber's paradox. That the night scale is not filled with starlight. That our complete field of view is not consumed by light. Just as the the Sun consumes our field of view (and so its apparent brightness is the same as its intrinsic brightness, we do not see a sky thermally radiating at 6000K like the sun.
Rather at microwave regime at 2.7K. A good explanation is like that of Sciama. The excess curvature we see in the universe (that we attribute to dark matter) is explicable by the presence of this cold old matter. Less dense and barely ticking off time it does not radiate. The voids in the sky are just old times in which time flowed too slowly for anything to reach us. The excess curvature observed comes from these cold shadowy parts. We see curvature because a circular disc traversing these parts will be bathed in a cold heat (as it were). The rulers strangely should be smaller in these regimes and thus circles will have circumferences of greater than 2𝝅R.