I'm not talking about gradual red-shifting, that happens slowly anyway, but with a universe of finite size, we should actually see Cosmic Background Radiation turn off in a sense, first at a point, then slowly disappearing in an expanding circle, like it's being turned off? - or am I thinking about this wrong?
The only reason we see CMB now from all directions is cause the universe was greater than 13.5 billion light years radius from where we are now at the time of the background radiation, some 13.5 billion years ago - kinda. In other words, the universe had to be at least 13.5 billion light years radius at just 380,000 years of age.
Of-course, if the universe is much larger than that, this may not happen for an enormously long time, but in a finite universe this should still happen?
or am I thinking about this all wrong. - Thanks.