It's measured about 70 km/sec/megaparsec. This is a direct measurement using red shift to measure recessional velocity, and different standard candles depending on the distance. So, at a distance of one megaparsec, the expansion rate is 70 km/sec; at two megaparsecs the expansion rate is 140 km/sec; and so on. This suggests the rate of expansion is greater as we go back in time; or conversely, that the rate of expansion is slower as we go forward in time. How is this reconciled with the 1998 measurements that the rate of expansion is actually speeding up? AG
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