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A black hole It is an object whose gravity is so great that the escape velocity is greater than the speed of light. The light that tries to escape from a black hole falls back on its surface just like a stone thrown into the air. Therefore, a black hole is invisible from the outside.
The body is surrounded by a spherical border, called the event horizon, through which light can enter, but cannot exit, so it appears to be completely black.
If a star that has used up its nuclear fuel exceeds the solar mass by eight times, then the collapse does not stop even at the neutron star stage, but can continue indefinitely causing matter to concentrate on a mathematical point, while its density and the force of gravity tend to become infinite.
The effects of a similar process are disconcerting and difficult to understand not only for common sense, but even for physics itself. The gravity exerted by the object that collapsed would be so powerful that not even the particles of light emitted from its surface could escape. The object would become invisible, leaving in its place a completely dark area: precisely a black hole.
The space, which as provided by Einstein's theory of general relativity is curved by the presence of a mass, would experience a deformation such as to become an endless funnel, along which the object that collapsed would would slide disappearing from our Universe.
In 1974 the British physicist Stephen William Hawking concludes that black holes are not completely black; It shows that they can lose energy and matter in the form of elementary particles, and that this process is accelerating until it becomes explosive.
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