Video narration
If nothing can travel faster than light, how can a black hole trap light? Think of dropping a ball. It falls because gravity changes the path it can take: downward, not upward. But a black hole is not a cosmic vacuum cleaner, sucking in everything nearby. It forms when enough mass is packed into a tiny region, curving spacetime-the fabric of space and time. Now spacetime leaves no outward path. That boundary is the event horizon. It isn't a solid surface. It marks the point beyond which every possible path leads inward. Light still moves at light speed, but every route available to it points deeper into the black hole. Outside, objects can orbit or escape; inside, escape is impossible. So how does a black hole trap light? Not by pulling it like a vacuum. Beyond the event horizon, spacetime gives light no way out.