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$\begingroup$ Please cite sources that list each of these distances. $\endgroup$– AaronCommented Sep 6, 2014 at 16:19
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2$\begingroup$ Assuming @Aaron is right (and I have no reason to think otherwise), someone could have found 23 billion light-years by assuming that 46 billion light-years was a diameter, and not a radius. $\endgroup$– HDE 226868 ♦Commented Sep 6, 2014 at 20:11
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