Question

Was the universe expanding at a constant rate before dark energy began to take over ?​

Answer 1

Answer:

Cosmologists estimate that the acceleration began roughly 5 billion years ago. Before that, it is thought that the expansion was decelerating, due to the attractive influence of matter. The density of dark matter in an expanding universe decreases more quickly than dark energy, and eventually the dark energy dominates.

Answer 2

The first observational evidence for its existence came from measurements of supernovae, which showed that the universe does not expand at a constant rate; rather, the expansion of the universe is accelerating.

Hope it helps :)

Thank you for your thanks but how you did I mean I know how to give multiple thanks but they are usually less in number.