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...One would expect, then, that their physical properties would be different, and more generally, that the universe as a whole would have varying properties in different areas.
OK. A more reasoned response but still not one which answers my specific question. Is the ten billion the emission distance or the reception distance.
OK. Total newbie here but I think I have an 'issue' with the horizon problem as it is stated on pretty much every website that I look at. Here is a direct extract from wikipedia regarding the horizon problem:"If one were to look at a galaxy ten billion light years away in one direction, say "west", and another in the opposite direction, "east", the total distance between them is twenty billion light years."Before I get to that problem let me ask a question.Assuming we could see through the Cosmic Microwave Background Radiation (CMB) basically right to the big bang (assume we can detect and view gravitational waves say and thus observe beyond the CMB) - The question is.. In which direction would I have to look to observe the universe (and in order to avoid some complication) when it was say the size of a marble or some other similar very small (non zero) size?I believe the answer to that question leads inescapably to conclusions which undermine the whole basis for the 'horizon problem' but I would like some comments or answers to the question first.Cheers JS