Video narration
What happens if you fall into a black hole? Imagine a stretchy band pulled from both ends: one side feels a stronger pull. But there's no solid rim to hit. The event horizon is the boundary beyond which nothing-not even light-can escape. Crossing it is not instant death, but you can't turn back. The black hole's size decides where the pull becomes deadly. Near a small black hole, gravity pulls much harder on your feet than your head; that difference, called tidal forces, stretches you apart near the horizon. At a giant black hole, the pull changes more gently across your body, so you can cross the horizon before that stretching becomes fatal. Deeper inside, it becomes fatal. What happens at the center isn't fully explained by current physics. So you cross the point of no return; small holes tear you apart near the edge, giants deeper in.