Are you know what is the black hole and why it is effective
A black hole is a region of spacetime from which nothing,not even light,can escape. The theory of general relativity predicts that a sufficiently compact mass will deform space time to form a black hole. Around a black hole there is a mathematically difined surface called an EVENT HORIZON that marks the point of no return. It is called BLACK HOLE because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodyamics. Quantum machanics predicts that black holes emit radiation like a black body with a finite tempreature. This tempreature is inversely proportional to the mass of the black hole, making it difficult to observe this radiation for black hole, making it difficult to oserve this radiation for black holes of stellar mass.
Black holes of stellar mass are expected to form when massive star collapse in a supernova at the end of their life cycle. After a Black hole has formed it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses may be formed.
There is growing consensus that supermassive black holes exist in the centers of most galaxies. In particular, there is strong evidence of a black hole of more than 4 million solar masses at the centre of our
Milkey way.
Main article: Event horizon
