Black hole wiki, creation of blackhole and its effects

Black hole is nothing but an object having very high gravitational force so that even light having so much velocity does not succeed to escape from it if once caught in side it. It has such dimensions that it is concentrated at a point only with all its mass this is referred to as singularity and due to so strong gravitational force at such a small point makes this singularity such that time and space crushes together and becomes indistinguishable i.e. looses their independent existence. The gravitational force decreases with the increase in distance from it which depends upon the mass of singularity. The influence of the gravitational force can also be seen from the fact that the minimum velocity required by an object to escape from its force of attraction while passing from neighbourhood at minimum possible distance is equal to velocity of light. And his minimum required distance makes its "horizon" i.e. something like its surface through which its existence may be defined in free space beyond the singularity point. And any object that comes within this horizon gets trapped inside it and gets lost forever within the instance gravitational force.

Formation of black holes

When an object attains a certain high critical density producing such a high gravitational force make it collapse within its and giving it infinitely small point size. The time when a massive star is not capable of producing energy in its core it leads to formation of the Stellar- mass black hole i.e. it the energy generating in its core causes to counter balance the gravitational force of its mass so in absence of this mass it collapses at this time two situations are possible either the outer layers of the star blast out and move into the free space of to fall inside the formed black hole and strengthen it by making it more massive. Still the formation of the massive black holes is not clearly known, there are many estimations about its formation like maybe they are formed due to collapse of the large gas clouds or it may be a result of fusion of many small black hole to form a large one.

Black holes in universe

Many super massive blacks have been found in the nearby galaxies and many at far distances like quasars in our own galaxy, i.e. Milky Way, a dozen or two stellar black holes have been identified also some intermediate mass galaxies have been found in Milky Way and also in nearby galaxies. The super massive black holes are usually found at the centre of the most galaxies causing all the other mass revolving around it and some stellar black holes anywhere in the galaxy. In this way thousands of such black are there in the galaxies presently known.