[aruanan]

It may not be the left over light from the big bang doppler shifted.

What I'd like to know is how, in an expanding universe in which light moves at a constant speed and throughout which nothing can move faster than light, any electromagnetic radiation "left over" from the Big Bang that is not the artifact of an almost infinite series of reflections can be observed by anyone who has not been moving at the speed of light from the very moment of the Big Bang. Based upon the proposed rate of expansion and the age of the universe, for distinct point sources of light what is the upper limit on the oldest image that could be expected to be seen?

[RightWhale]

There was a thread last week about some new physics lab device that can shift a light spectrum just about any amount by a series of internal reflections and an energy input at the right time. Might be related.