what is speed of expanding universe in seconds?
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Edwin Hubble was the first to measure the expansion rate. The number he got was way wrong, so I won't bother mentioning it, but good on him for trying. The more modern value is 68 kilometers per second per megaparsec, plus or minus a couple, but close enough.
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that's approx. equals to 67.4 km/s which is roughly considered as 68 km/s . But it is as estimated at a particular time . It does not always remain constant and it may increase or decrease with time
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