I appreciate what you're saying, George, but the link is still talking about microwave radiation, which I am not talking about, so it's not really pertinent to the discussion.
Thank you both. Just read about recombination, very interesting. I have a question for Vanadium 50: Is this a theoretical answer or can sensitive instruments find visible cosmic background radiation?
If what used to be visible light when the universe was smaller and younger has been stretched due to the Doppler effect so that it is now microwaves and detectable as the Cosmic Microwave Background Radiation that can be found everywhere, why hasn't the gamma or x-rays of the same period not...