rowrowrowyourboat , 5 hours ago

and normally they don’t interact

But dark energy and dark matter make up 95% of our universe. So they would be the “normal”.

If anything, the 5% that we do know would be the “abnormal”.

And anyway, it’s only called dark energy and dark matter, not because it doesn’t have a cause, but because it doesn’t interact with light (photons don’t interact with it).

Although I think you are right that they don’t know what causes it. It does interact with gravity, though.

But all this is way beyond my tiny brain.