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Black hole is very curious subjects of physics in Modern times.We have heard many stories of black hole. In beginning it was believed that black hole is empty space but it is opposite. The idea of a body is so huge that even light could not escape was given by John Michell in November 1974. A huge amount of matter is packed into a very tiny area which results in strong gravitational field.
Einstein theory of relativity predicted the black holes. According to this story when a huge star dies, it leaves behind a tiny dense remnant core. If the mass of core is more than about three times the mass of the Sun, the equations showed, the gravitational force overwhelms all other forces and produces a black hole.
Scientists are not able to observe the black holes directly with telescopes which detect X rays, light or other forms of electromagnetic radiation. However scientists can observe the presence of the black holes and study the effect on nearby matters. If a black hole passes through a cloud of interstellar matter, for example, it will draw matter inward in a process known as accretion. A same process can happen if a normal star goes close to a black hole. In this scenario, the black hole can break the star apart as it pulls it toward itself. As the attracted matter accelerates and heats up, it emits x-rays that radiate into space. Recent discoveries offer some tantalizing evidence that black holes have a dramatic influence on the neighborhoods around them - emitting powerful gamma ray bursts, devouring nearby stars, and spurring the growth of new stars in some areas while stalling it in others.