Black hole is another amazing about the universe. Since the big bang, it created lots of mysteries that we still cannot explain in a scientific way. Black hole is one of those. When a star is approaching its death it will expand into a very large scale. The inside mass cannot hole the outsider mass anymore and it will crash the center of the star and the black hole born. It will suck everything around it in to its center including light. Scientists call it the monster of the universe.