In breakthrough discovery, Physicists at the John Hopkins University have found “the smoking gun that shows the universe went through extremely rapid expansion in the moments after the big bang.” The universe grew from the size of a marble to a volume larger than all of observable space in less than a trillion-trillionth of a second, according to the finding.
In pic: The graphic provided by NASA illustrates the idea that the expansion of the universe over most of it`s history has been relatively gradual.
Read: Evidence for expanding universe theory found.