Scientists Just Discovered the Universe Has an Edge | Brian Greene

You know, for centuries we’ve imagined the universe as infinite. Endless. Stretching forever in every direction. But what if that’s wrong? What if the universe actually has an edge? And I don’t mean an edge like the edge of a table floating in empty space. I mean something far stranger — a boundary written into the very geometry of reality itself. In this episode, we explore a stunning new development in cosmology suggesting that the universe may not be infinite after all. Using data from the cosmic microwave background, large-scale structure surveys, and new theoretical models in quantum gravity, scientists are beginning to ask a question that once seemed almost philosophical: Does space itself come to an end? What would it mean if it did? Would there be a wall? A curvature? A fold back into itself? Or something even more bizarre — like space transitioning into a completely different phase of reality? And perhaps most unsettling of all… if there is an edge, what lies beyond it? This is not science fiction. This is physics at the frontier — where geometry, quantum theory, and cosmology collide. And the answer may permanently change how you think about infinity.