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If an astronaut decided to journey into a black hole, he’d feel like he’d wandered into a medieval torture chamber. For a black hole with a few times the Sun’s mass, an astronaut heading in feet-first would have his feet pulled much more strongly than his head, and he’d end up looking like a spaghetti noodle. Because time slows down in strong gravitational fields, the astronaut’s watch would also run slow. To an outside observer, the astronaut would slow down to a stop when he reached the event horizon. But to the astronaut, the rest of the universe is running fast, and he’d see the entire history of the universe pass before his eyes before crossing the event horizon. The astronaut essentially leaves our universe—to end up who knows where, if he even survives—because, from his point of view, our universe will have ended.
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