A black hole forms when a star reaches the end of its life cycle. A star's core is a fusion reactor. The intense heat causes hydrogen atoms to fuse together like melting metal and sticking it together. When two atoms are fused together a gigantic amount of energy is released which keeps the star hot, and is the reason why hydrogen bombs explode. A star will continue to fuse small elements together until it runs out of small elements and only has massive elements like iron. As we know the more massive an object is the greater gravity it has. The core's gravity will become so great that the outer layer of the star will collapse in on the core, causing it to become even more massive which will give even more gravity which will cause it to get even more massive so the matter is infinitely compacted. Some scientists say that it rips a hole is space-time. An example is if you punch a cloth you probably will not break it, but if you stab it with a needle you probably will. Your fist is like a star the needle is like a black hole and the cloth is like space-time.
As you can see in the picture to the right a black hole is like a sphere to imagine where a black hole goes lets imagine a 2d world. Say you are flat man and a black hole is a dot on a page and you thing where can it go but in. Of course it can go up but you are flat man and you cant comprehend up. When we see a sphere we think where can it go but in. The truth is it goes in an comprehendible direction into the 4th dimension. Some say if you go into one it will drop you back into the 3d at another place and time, but other say it will kill you. To learn more about the fourth dimension read my post about it. For even more things to ponder keep reading the philosophy of everything.
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