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Originally Posted by OPVerma
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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Well, based on the observations which were made, the expansion of the universe decelerated for a time after the big bang because, they theorise, the attractive force of gravity outweighed the repulsive force of dark energy when mass was 'closer together' in the early universe, but at at some point, the galaxies became far enough apart that dark energy began to predominate over gravity, and since then, expansion has been accelerating.