Black holes are so massive that not even light can escape their gravitational pull, so by their nature
they are invisible. This is the famous reason that we know, but it needs some prefix. And also it is not
the only one. The other could relate to its structure.
If we look at the star, plant and also an atom structure, we could find the structure for the black hole
too. Black holes have a surrounding area and the more compact center.
In this paper we are going to explain more about this structure and we will introduce other reason that
causes the black hole invisible.
