What are black holes?
Have you ever had to vacuum your bed room? When you do, watch closely because you will see the dirt, and crumbs start to move towards the vacuum cleaner. A black hole is similar to a vacuum cleaner, cleaning up debris left behind in outer space.
It is not suction power that makes things fall into a black hole. Suction would not be strong enough. Instead a black hole uses the power of gravity to pull things towards it.
How do black holes form?
When a large star runs out of fuel it can no longer support its heavy weight. The pressure from the star's massive layers of hydrogen press down forcing the star to get smaller and smaller and smaller. Eventually the star will get even smaller than an atom. Imagine that for a moment an entire star squashed up into less space than a tiny atom.
How can something get smaller, but retain the same amount of mass, or stuff?
It is really quite simple. If you take a sponge the size of a soda can you can easily squish it in your hands until it is completely covered. But here is the interesting part. If you make something smaller by squishing it, its gravity becomes much stronger. Imagine then, if you squish a star into the size of an atom how powerful its gravity would become.
A black hole's gravity becomes so powerful that anything including light that gets too close, gets pulled in. That's right, not even light can escape the grasp of a black hole. The middle of a black hole is called a Singularity. Singularity is simply a big word that means squashed up star.
When you get too close to the singularity you will begin to fall into it. When you begin to fall toward it you know you have passed the Outer Event Horizon. At this point you could still escape, but you had better hurry, because as soon as you pass the Inner Event Horizon it will be too late.
How can you fall into a black hole?.
Think of the Earth. When you are in outer space you can float around. If you get too close to the Earth you will be pulled in. On the Earth you could leave again in a rocket ship. However if you fall into a black hole there would be no way to get out.
