In article ,
"Phillip Helbig (undress to reply)" writes:

It is just that: Cosmic Background. The sea of galaxies is bathed
in the relic light from all uncountable galaxies extending
till who knows where. This explains why is so uniform.

Your hypothesis cannot explain the power spectrum of the CMB.

That would be the power spectrum of the fluctuations.

Perhaps even more fundamentally, the "sea of light" cannot explain
why the spectral energy distribution of the CMBR is a perfect
blackbody with unit emissivity. This has been known since COBE.

Posters to this thread should watch and understand the Dan Hooper
colloquium I mentioned on Oct 20:
https://youtu.be/pPs_tvDYAl4

There are still many unknowns, but the unconventional suggestions
posted here are not new and are contrary to observations.

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