Explain · Like I'm five version
Black holes in terms of a bath plughole
Is a black hole just a very hungry drain in space?
A black hole is basically a giant space plughole that pulls everything inside it. When something gets too close to the edge, it cannot swim away or hop out. It is just like when you pull the plug in your bath and the water starts to swirl around the drain. The water gets faster and faster as it gets closer to the middle until it disappears down the pipe.
Space is full of invisible drains that are much stronger than your bathroom sink. These big black holes have so much power that they pull in everything nearby. They act like a giant vacuum cleaner that never gets full, even after eating big stars or clouds of space dust. Once something goes past the special line near the edge, it is gone forever. It is like trying to retrieve your favourite yellow rubber duck after it has already gone down the drain.
The most amazing thing is that light itself cannot escape from these deep space holes. If you shone a very bright torch into the hole, the light would be pulled in just like the bath bubbles. Because no light can bounce back to our eyes, the hole looks completely black. It is the messiest sink in the universe, and there is absolutely no way to put the plug back in to stop the water.
Where the analogy breaks downA bath plug connects to a pipe leading elsewhere, but a black hole is a one way trip to a point of infinite density.