In article ,
jacobnavia writes:
If the sea of galaxies extends to infinity (or to huge distances) the
farther you look, the more galaxies you will observe for a given solid
angle. At great distances you will see a wall of galaxies that fills
completely the view. The (very red-shifted) light from those galaxies is
the CMB.

As JT pointed out, this is closely related to Olbers' Paradox; the
resolution of which is well known. The point is that the "light from
these galaxies" cannot fit the spectral energy distribution (SED) of
the CMB. If you don't know what an SED is, have a look at
http://coolwiki.ipac.caltech.edu/index.php/SED_plots
which defines it. (The article is over-simplified in places, and I
don't agree with the "Units Matter" section, but the definition of
SED and basic explanation of it are accurate.)

"Sea of galaxies" was a possible model for the CMB until COBE flew,
but that model is inconsistent with COBE and later data.

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