Question

What is the driving force behind the expansion of space?

Answer 1

It is the initial force received during the big bang.

Now the universe is not only expanding but accelerating due to dark energy.

Hope this will help you ✌

Answer 2

Explanation:

The finding led to the now widely accepted theory of dark energy, a mysterious force that repels gravity. Measurements show that dark energy accounts for about 74 percent of the substance of the universe.

I hope it can help you