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Celestial body, with a gravitational field so intense as to leave no escape neither matter nor electromagnetic radiation. In a black hole, the force of gravity dominates over any other force, so that a continuous gravitational collapse occurs, which tends to concentrate the material into a infinite density singularity point. The surface of a black hole is the boundary of the region from which it can not get out any signal: this surface, can be crossed by matter or radiation that falls towards the black hole, but not in the opposite direction. Because the black hole can not be proved directly, its presence can be inferred from the motion of other celestial bodies in the vicinity: in this way, for example, has been found to exist in the nucleus of our galaxy of a central building collapsed, a lot probably just a black hole whose mass was estimated at 2.5 billion solar masses. This will still additionally reinforces the hypothesis that the nucleus of galaxies as a rule there is a massive black hole, formed even before the stars: in the frequently observed phenomenon of encounter and fusion between two galaxies, the two central holes blacks become part of a close binary system loses more rapidly energy to gravitational wave emission. The revelation of a black hole is also made possible by the X-rays emitted by matter falling toward it. Objects whose gravitational fields are too strong to allow light to escape have been theorized in the eighteenth century by John Michell and Pierre-Simon Laplace. The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, although his performance relative to a region of space from which nothing can escape was published by David Finkelstein in 1958. A long considered a mathematical curiosity, dates back to the 60’s theoretical proof that blacks holes were a generic prediction of general relativity. The subsequent discovery of neutron stars sparked interest in compact objects collapsed on themselves because of their gravitational force as a possible astrophysical reality.
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