Here's why:
* Extreme Gravity: Black holes are incredibly dense objects with a gravitational pull so strong that nothing, not even light, can escape.
* Escape Velocity: Every object has an escape velocity, the speed an object needs to reach to break free from the gravitational pull of a celestial body. For a black hole, the escape velocity exceeds the speed of light.
* Event Horizon: The boundary around a black hole where the escape velocity equals the speed of light is called the event horizon. Anything that crosses the event horizon, including light, is trapped forever.
It's important to note:
* Light is not "pulled" in: Light doesn't experience gravity in the same way massive objects do. Instead, the extreme curvature of spacetime near a black hole bends the path of light so much that it becomes trapped.
* Time Dilation: Time itself slows down near a black hole, making it seem as if the light is slowing down and eventually stopping.
Think of it this way: Imagine a bowling ball placed on a trampoline. It creates a deep dip in the fabric. If you roll a marble across the trampoline, it will curve around the bowling ball. Now imagine a massive bowling ball creating an even deeper dip. The marble's path would curve so much that it would fall into the dip. That's similar to how gravity affects light near a black hole.
