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George: In case "2.", you will see light in the form of microwaves - the CMB. Redshift is a key factor but there are others as well. The evidence favors BB.
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George, this is a very interesting point, about the CMB. Taking it one step further, if we continue to examine the greatest possible distances with progressively longer wavelengths, even beyond the microwave range, what will we see? Since redshift (which may or may not be space-expanding-Doppler related) will continue to stretch wavenlength with distance, it would stand that the further we look the longer will be the necessary wavelength to image anything there. Assuming we have the technological capability to do this, we should either see more galaxies beyond our current viewing threshold, or if BB is true, then we should see nothing. But if we do image beyond the theorized ABT and more and more galaxies show up, no matter how fuzzy, then the whole idea of BB is thrown into doubt. This will be the key experimental evidence for the future to determine whether BBT is true or not. Of course, this would mean we would have to break the 'CMB barrier'. I can't wait!
Cheers, Ivan