Originally Posted By: Orac
That was the original problem if the universe wasn't expanding we would expect to see red shifts, blue shifts and nuetral galaxies which we don't .. we see only red.

We only (predominantly) see redshift because there are vast, free matter permeated, spaces between us and ALL of those galaxies!

We would expect to see red shifts, blue shifts and neutral galaxies in a non-expanding universe ONLY if there were NO random atoms scattered between us and those galaxies.

ALL of the light emitted by ALL of those galaxies has effectively traveled through a medium the atoms of which have absorbed the original photons then emitted their own photons resulting in the aforesaid loss of energy.