The Biggest Hole in Our Theory of the Universe

The goal of physics is not just to explain why cannonballs fly over castle walls or why the earth goes around the sun. We seek a unified holistic description of the entire universe in terms of a simple equation, which means that we have a pretty tall order. So we go out there and look for the most extreme, the craziest, the bonkers situations where our understanding of the universe bends and breaks and snaps. That also gives us an opportunity to be creative and think about, what is out there beyond our understanding?