Good question about the CMBR and vacuum energy density of space. In my opinion, unless the universe started out with the very high vacuum energy density postulated used in BBT, the CMBR did not arise in a very small, hot universe. Where did it come from you may ask? I do not know Other posts like #13-15 touch upon the changing TCMB plotted to redshifts but very limited data points here and certainly not back to 3000K or 3300K that may be needed. Even the data points showing TCMB to redshift out to near z=7.0 today do not show a vacuum energy density like used in inflation or origin of CMBR modeling.Rod
"I would say the doctrine of uniformity falls apart AGREED
(science in the here and now does not) AGREED
and the explanation for the origin of the CMBR falls apart too. Could you explain please?