A black hole is a object that is so compact that its gravitational force is so strong light cannot even escape it. It is probably is impossible to escape it gravitational pull. Black holes maybe a bridge between universes.

 

How are black holes formed?

 

Black holes are formed when an object is unstable to withstand the compressing force of its gravity. Black holes grow everytime they consume an object. Black holes usually consume stars and gases nearby.

 

There are two types of black holes. The stellar-mass black hole and the super-massive blackhole. Stellar-mass black holes are formed when massive stars run out of nuclear fuel. They explode as a super-nova and what is left becomes a stellar-mass black hole. As for the super-massive black hole, not much is known of the birth of these giants. Super-massive black holes are much heavier than the stellar-mass black holes. These black holes only live in the center of galaxies. A theory of how they are formed is that they used to be a stellar-mass black hole but over the course of billions of years, they grew into super-massive black holes.