Astrophysicist explains big GRAVITATIONAL WAVE discovery! Are they NEW PHYSICS or merging SMBHs?

The BIG news in physics is that a new type of gravitational wave has been detected using pulsar timing arrays. In this video we're chatting about what a pulsar timing array actually is, what's been found, and why the gravitational waves might be from pairs of supermassive black holes orbiting each other, but there's evidence that they could be from new physics processes occurring in the early Universe...