Black Holes: Why Can't Anything Escape Them?

Imagine a star ten times bigger than our Sun. Now imagine squeezing all that 'stuff' down until it fits inside a city the size of New York. When you pack that much mass into such a tiny space, gravity goes crazy.

This is a Black Hole. Its pull is so intense that it creates a hole in the fabric of space itself. It isn't a hole you can fall through to the other side; it's a place where gravity has become so strong that nothing—not even light—can get away.

To leave Earth, a rocket must travel 7 miles per second. This is called 'escape velocity.' The faster the gravity, the higher the speed you need to escape. Light travels at 186,000 miles per second—the fastest speed possible.

Inside a black hole, the escape velocity is higher than the speed of light. Since nothing can go faster than light, nothing can ever get out. It’s the universe’s ultimate one-way street.

Because light is trapped inside, a black hole is completely invisible. It’s like trying to find a black cat in a dark room with no flashlight. We only know they are there because we see how they affect the things around them.

We can see stars orbiting 'nothing' at incredible speeds, or gas being sucked into a swirl. When the gas gets pulled in, it heats up and glows brightly, outlining the black hole like a 'shadow' in space.