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222 | Andrew Strominger on Quantum Gravity and the Real World
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
What Is the Photon Ring?
A black hole is like a hall of mirrors. If you shine a light on your face, bounce off your face, the photon can go off and head towards the black hole that will just fall in. But if it just misses it, it will boomerang around the back and come back to you. You'll actually see an infinite number of images of yourself if you had perfect resolution while looking at a black hole. This is extremely interesting for understanding and measuring the laws of physics because we don't know much about what that swirling disk is made of. The members of the Event Horizon Telescope are very keen to learn to see properties of curved space time.
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