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SCIENTISTS GUESSTIMATE BEGINNING OF ACCELERATING EXPANSION SINCE 5 BILLION YEARS AGO
Wikipedia writes
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'The expansion of the universe is thought to have been accelerating since the universe entered its dark-energy-dominated era roughly 5 billion years ago.'
Though they talk about dark energy, gravity etc. but scientists are unable to calculate mathematically and give an exact figure.The 5 billion yrs figure above is a guesstimate work.
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