One of the additional evidences for expansion is the delayed light curve of distant type 1a supernovae. Type 1a are standard candles—that is they are all about the same brightness and their brightness fades at about the same rate after the initial explosion. But the farther away we see them (their distances also indicated by Cepheid variables in the same galaxy), the slower their brightness fades. This is because Special Relativistic effects are occurring due to their receding away at speeds also indicated by their red shift.
Another one is the higher CMBR temperatures observed in distant intergalactic gas. As the universe expands, the CMBR cools, as predicted.
There are a few others, including observed evolution of galaxies with distance and the increasing abundance of quasars. All these point to expansion. If the red-shifting of distant galaxies are due to something else, it is not known what. The idea of “tired light” has no supporting evidence at all.
Let us look at the temperature issue first.
https://observatoiredeparis.psl.eu/taking-the-temperature-of-the-universe.html
The article acknowledges that these temperature calculations are based on computer models.
If the models are wrong the temperatures are wrong.
This article suggests the “delayed light curve” analysis is ultimately dependent on the “red shift”—yet again.
https://www.mdpi.com/2075-4434/13/3/55
What I have noticed with much of modern cosmology is that they tend to start with a conclusion (the expanding universe) and then tend to use computer models that support it and reject as “anomalous” those that reject it.
The ground is not as solid as it may appear.
#35 ...One of the additional evidences for expansion is the delayed light curve of distant type 1a supernovae.
Naw... we are a but a drop on a microscope slide spreading out in an alien laboratory. Eventually we will start to shrink as we dry out....