CMBR question

From reviewing the "space-time" diagrams at:
http://www.astro.ucla.edu/~wright/cosmo_02.htm
And noting that the number of identified objects at distance roughly
corresponds to the length of any "constant distance" gradient...

Is the CMBR really some highly magnified object, stuck in the "lens"
represented by this curved spacetime? In other words, could the CMBR
really be the surface of a star, or (more likely) a nebula?

I know it is felt that it is not very thick, because of its "pure"
spectrum...

David A. Smith

Dear Steve Willner:

"Steve Willner" wrote in message
...
In article naFZa.9246$2g.6725@fed1read05,
\(formerly\)" dlzc1.cox@net writes:
Is the CMBR really some highly magnified object, stuck in the "lens"
represented by this curved spacetime? In other words, could the CMBR
really be the surface of a star, or (more likely) a nebula?

I think you will have a hard time finding a lens that images over 4
pi steradians, especially to the smoothness of the microwave
background. Also, lenses preserve surface brightness. What object
has a surface brightness temperature of 2.7 K and the energy density
of the microwave background?

It has the spectrum of a *very* hot gas, which is why we know how far back
it is. I think it was something like 20,000K, unless I have my facts
screwed up again...

Perhaps a fisheye lens will correct a part of it? I figure it will still
be a blur...

David A. Smith