What Is Dark Energy and What Don't We Know About It?

The takeaway from dark energy is the universe is expanding. It's expanding faster and faster. We don't know why that's happening because we can't explain where this potential energy is coming from. Black holes are one of the other really fascinating, big, misunderstood things in the universe. They're a spot in space that is so dense with energy and matter that space is curved so intensely that nothing can escape past this event horizon.