In 1998,it was announced that the expansion of the universe is accelerating.What does this imply from the perspective of the Big Bang?

Question

Quizplus · Accepted Answer

The discovery of the acceleration of the expansion of the universe implies the existence of a previously unknown force, now known as dark energy. This goes against earlier assumptions that the expansion of the universe was slowing down due to the pull of gravity from matter. The existence of dark energy requires a change in our understanding of the universe and how it has evolved since the Big Bang.

In 1998,it Was Announced That the Expansion of the Universe