From the outset of Western thought and Heraclitus' claim that 'everything changes', thinkers have argued about whether the world is fundamentally static or in flux. This is no mere philosophical debate. The extraordinary success of science has been founded on the notion that unchanging universal laws underlie everything and the fabric of nature remains constant. Yet now, based on the investigation of ancient quasar light and the X-ray properties of distant galaxies, leading scientists are challenging this central idea and proposing that the very laws of the universe might change.

Are unchanging laws the only way to understand the universe or do we need a radically new framework to make sense of a universe in flux? And, if we were to accept changing universal laws, would we not require unchanging laws that explain those changes themselves?

Radical physicist Lee Smolin, YouTube sensation, theoretical physicist Sabine Hossenfelder and physicist and best-selling author Paul Davies thrash out the big questions about the nature of the universe.