ELI5- If the universe is expanding (& the speed of expansion is accelerating) then what is the source of this energy that is driving this expansion & acceleration?

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ELI5- If the universe is expanding (& the speed of expansion is accelerating) then what is the source of this energy that is driving this expansion & acceleration?

In: Physics

Scientists dont really know and they call the force that’s accelerating the expansion dark energy.

We don’t know, there is the possibility that there are other big bangs outside our visible universe and the gravity from those “universes” are pulling on ours and preventing it collapsing in on itself. https://youtu.be/t80qywmnADM

Good question! Anyone who figures it out will have a Nobel prize waiting for them. Right now the answer is mostly a shrug and a “some kind of energy that we can’t detect, I guess?”.

Iirc the expansion itself is what started the big bang theory. So the energy from the big bag is whats causing the explansion