What Is Black Hole?


black hole

A black hole is a region of space where gravity is so strong that nothing can escape, not even light. The gravity is so strong because matter has been squeezed into a tiny space. Black holes are often the result of a supernova, the explosion of a large star. The star at the center of a supernova is so dense and has so much gravity that it collapses into a black hole when the supernova ends. Black holes are very dense, and the intense gravity causes incredible amounts of pressure. The pressure of the gas inside a star is also incredible: enough to cause a stir to violently collapse. In the process, the star can explode in one of two ways: a blue supernova, in which the star's core collapses and explodes with a flash of light and a great, expanding cloud of gas and dust; or a red supernova, in which the star's core is so hot that the matter blows away from the star, leaving behind a very small, hot, dense mass of gas that collapses into a black hole.

 Such a star is called a neutron star. It has so much gravity that nothing can escape except gravity. The gravity of a neutron star is so strong that it has the same effect on time as the gravity of a black hole. A black hole has properties that are mathematically similar to the ones of a star that is collapsing into a black hole.

black hole

 A black hole may be formed when a large star collapses or when a neutron star, a small star made almost entirely of neutrons, is produced by the merger of two normal stars. A black hole is much smaller than a neutron star, but it has a mass much greater than the mass of the star it came from. Most neutron stars have a mass of about 1.4 times the mass of the sun, whereas some black holes may have a mass greater than that of the sun. Neutron stars may also have a mass loss.

 The star collapses because the pressure of the gas and the star's weight prevent the gas from escaping; the star squeezes itself inwards until the gas can't any longer contain the weight. This collapse is similar to how a boy squeezes a balloon; the force to do it is the same, but the balloon can't hold its shape as it gets smaller and smaller. When the star has shrunk down to the size of an atom, the pressure of the gas can no longer contain the gravity of the collapsed star. The star has squeezed itself into a tiny space with such force that it has become a black hole; there is no escaping the gravity and no way for anything to escape the gravitational pull, no matter how far from the black hole.

 Because the matter that makes up black holes is so compressed, it forms a region of extremely strong gravity, much stronger than in normal regions of space. Because light cannot escape from a black hole, it is invisible. 

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