What are stars?

       Stars are nothing but gigantic balls stuffed with gas, mostly of hydrogen. Along with this huge and huge amount of gas there are some other materials dumped inside them which gives the star “The most powerful gravity” which can hold everything together.

 Due to this high gravity the gas inside star becomes very dense and hot.

As everyone know our Sun is a star. Good question! Then why we are not being pulled in due to its high gravity? Because are the planets around the sun(including our earth) are at a safer distance so that the gravity will not eat us.

Now, Is there anything in the space called as Black Hole?

      Yes, Of course. But before that let me tell you two processes which happening inside the stars.

1. Nuclear Fusion

       The nuclear fusion reaction tends to blow out the abundant amount of hydrogen outwards from the star’s center.

Nuclear fusion reaction inside star

 2. Gravity

             The monster gravity again tends to pull back the hydrogen to its center in the same direction through which hydrogen was blown out.

Gravity pulling hydrogen back to center

The Black Hole Formation

       The above two processes get repeated until the hydrogen is exhausted completely and gravity to win. When the gravity dominates the Nuclear Fusion the star becomes unstable and collapsed.

Formation of a Black Hole

When the star collapses it does not stop, the start and its atoms starts to shrink inwards resulting in undefined mass called The Black Hole.

Size of the Star before and after changing into a black hole.

 Stars are usually 3 times larger than our Sun. But once the competitive processes inside the star happens the black hole shrinks 3 times from the original size.

Definition of Black Hole 

     Finally we define Black Hole as a region where matter collapses into infinite density and gravity so extreme that even light cannot escape from it.