What Is Dark Energy?

We know that space has some potential energy because of these quantum fields. We also observe that the universe is expanding as if there is some potential energy causing this gravitational repulsion. So we don't have an understanding of where the potential energy comes from to create the expansion that we see in space. Could there be another quantum field or something or something you're not seeing or thinking about? Absolutely. There can be. And so we think that's what dark energy is. It's some kind of potential energy that the universe has or that space has.