Blackhole is impossible to exist according to proven science.

From Wiki

A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.[6] The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

The first mistake of this theory is spacetime is a meaningless word puzzle, what is spacetime? How to deform spacetime? What is a compact mass? Based on what mechanism GR predicts black hole? 

The second mistake is spacetime is not matter, spacetime has no mass, therefore spacetime cannot exhibiting gravitational acceleration.

The third mistake is light only coexisting with the medium/matter, there is no light traveling in vacuum space there is no light escape from stars. The present theory of light is wrong, light is visible frequency alternating current in matter/medium/air/water/glass/plasma. 

The fourth mistake is if a star has strong gravity that able to attract light, decelerate light, or bend light, then bigger starlight will go slower and light will not follow a straight line.