Video narration
Is a black hole really an empty hole that sucks up everything nearby—like a cosmic cliff you can never climb back from? Not quite. A black hole is a region of space where an enormous amount of matter has been packed into an extremely small area. Its gravity becomes so intense that it bends space and time, creating a boundary called the event horizon: cross it, and escape is impossible. That’s the twist. A black hole isn’t defined by sucking things in. From far enough away, objects can orbit it safely, just as planets orbit a star. So how can one form? When enough matter collapses into a compact region, its gravity can become strong enough to create that one-way boundary. So, what is a black hole? It’s a region of space where gravity is so strong that, beyond its event horizon, nothing—not even light—can get out.