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I've been following this discussion with considerable interest. From everything I have ever read or heard, the Big Bang theory assumes everything came from a singularity, a primordial atom that in a sense was the densest possible black hole. Assuming that is the case, and assuming that the theory of relativity is correct, it seems to me that there can be no particle whose light has not had time to reach us. Every particle should in principle be visible (if we have sensitive enough "telescopes") though the farther they are away from us, the more distant in the past would be the image we could detect. That is, we see Alpha Centauri where and as it was about 4 years ago, the Greater Magellan Cloud where it was and as it was about 150,000 years ago, etc. The suggestion that some things have not had time for radiation from them to reach us seems to require either severe modification or scrapping of the big bang theory or the theory of special relativity or both. Note that it does not really matter if the "primordial atom" were larger than the commonly assumed point. Unless it was larger in light years than the age of the universe, radiation from every particle should implicitly have reached us long since; but that completely tosses the big bang theory. Of course if you postulate items that neither emit or reflect radiation, they would be invisible even if they were very close. That's really outside the scope of this discussion, I think. Don Codling
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