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Originally Posted by Gem
13.7 billion years ago. I have explained the rationale of how that is worked out. You have yet to explain yours.
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Let us apply some commonsense mathemtics.
The present rate of expansion 20 km/sec/mlyrs was 15% less or ( 0.85 x 20 )= 17 Km/s/m, 7 billion years ago.
Before another 7 billion yrs ago ( or total 14 billion yrs ago ) the expansion rate was ( 17 x .85 ) = 14.45 km/sec/mlyrs.
So 13.7 billion yrs ago the expansion rate was not zero but about 14.45 Km/s/m