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The Schwarzschild Radius
As you get closer to the speed of light, things start to act very differently than what they do on like Earth in normal everyday speeds. As you put more energy in and all of a sudden it doesn't start increasing your velocity. Your momentum is sort of like how difficult it is to stop you moving. And so there's almost, again, this limit does not exist, right? You get this limit where nothing can go faster than the speed oflight. Just gets heavier,. That's interesting. Okay. What is the Schwarzschild radius? The Schwarzschild radius is the event horizon, essentially. So that sphere around the black hole where you don't get any information from.