The conversation between human and AI assistant.
What is the speed of a photon falling in a black hole?
That's interesting. Can you tell me more about the theory of relativity in relation to black holes?
Sure. Einstein's theory of relativity explains how gravity works in a curved space-time. In the case of a black hole, it predicts that the gravitational pull is so strong that nothing can escape its grasp, not even light. This is because a black hole warps space-time in such a way that it creates a "point of no return" called the event horizon. Beyond the event horizon, the gravitational pull is so strong that not even light can overcome it.