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What causes the universe to expand?

Answer 1

Dark Energy.

It was previously believed that the universe would expand for a while, come to an end, and then contract once more, much like a ball thrown upward toward the sky that eventually stops and falls back down.

However, in reality, this is not the case. According to scientific estimates, Dark Energy, which makes up roughly 68% of the universe, is what is causing the universe to expand faster.

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Answer 2

Alexander Acosta

The expansion of the universe is due to dark energy.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.