A black hole is a space which has a gravitational force that is so strong, nothing can escape its pull. Light can not even escape it. Black holes can be found anywhere in space, even where you least expect them. It has an invisible interior that is black so you can not tell what is inside these enorumous objects. It is impossible to escape from black holes because of the gravitational pull. No human alive can survive being pulled in a black hole. Once you are in it can rip you apart in a matter of seconds. Black holes are nearly impossible to see in space. Thye can be floating around anywhere and because they are not very big it makes it even harder to see. There is another thing in space that look like the black holes. It is called a worm hole. What worm holes are believed to do is take you time travelling. The existance of there worm holes has not yet been proven by scientiests.