Black hole, definition and study; A-Z index of Cognitio.

In astrophysics, a black hole is a celestial body with a gravitational field so intense that neither matter nor electromagnetic radiation can escape, i.e. a region of space time having a sufficiently large curvature, relativistic ally speaking, that nothing inside can escape outside, not even the light. The escape velocity of a black hole is higher than the speed of light, but since the speed of light is an unsurpassed limit, no particle of matter or radiation can move away from that region. A celestial body with this property cannot be directly observed. Its presence could be detected only indirectly, detecting its effects on the surrounding matter, such as gravitational interactions with other celestial bodies, or the effects on the matter that precipitates there, or the phenomenon of the gravitational lens. The existence of black holes is now attested, and objects of this type with very variable masses have been identified, from a minimum of five solar masses, up to black holes detectable on a galactic scale with a mass equal to billions of solar masses. At the center of a black hole, as described by general relativity, there is a gravitational singularity, a region in which the curvature of space time becomes infinite. For a non-rotating black hole, this region takes the form of a single point, while for a rotating black hole it is spread to form a ring singularity lying in the rotation plane. In both cases, the singular region has zero volume. It can be shown that the singular region contains the whole mass of the black hole. The singular region can therefore be thought of as having infinite density. Considering the exotic nature of black holes, it may be natural to ask whether such objects could exist in nature or to claim that they are only “pathological” solutions of Einstein’s equations. Einstein himself mistakenly thought that black holes would not form because he believed that the angular momentum of the collapsed particles would stabilize their motion at a certain radius. This led the relativists of the period to reject all the results contrary to this theory for many years. However, a minority continued to claim that black holes were physical objects and, by the late 1960s, most researchers were convinced that there was no obstacle to forming an event horizon. Towards the end of its life cycle, after consuming 90% of the hydrogen by nuclear fusion transforming it into helium, nuclear reactions stop in the nucleus of the star. The gravitational force, which was previously in equilibrium with the pressure generated by nuclear fusion reactions, prevails and compresses the mass of the star towards its center. Gravitational collapse requires a great density. At the moment these densities in the universe are found only in the stars, but in the early universe, shortly after the Big Bang, the densities were much higher, which probably allowed the creation of black holes.

Big Bang

Big Bang

Other solutions of the equations of general relativity with singularities called white holes have been studied several times (starting with Albert Einstein and Nathan Rosen in the thirties). Also theoretically, solutions obtained by bonding two solutions with singularities have also been hypothesized. These are called Einstein-Rosen bridges or Wormholes.

Wormholes

Wormholes

The possible (controversial) physical interpretations of such solutions have ignited the imagination of numerous science fiction writers. 

Quote by Alessandro Brizzi.

I am increasingly convinced that the black hole is simply a crossing of size, in my opinion the other life forms of the infinite universe, run around in the latter, through their own black holes, have developed a technology that defies all dynamic laws and human sciences, humans perhaps will never develop such elaborate equipment, if they never have direct contact with other interstellar life forms, they will most likely never get to develop such a science. And I’m increasingly convinced that black holes are “life-giving” let’s face it, everything that revolves around a black hole lives, so the galaxies of the universe in the center have a black hole that feeds the galaxy itself makes it alive because it moves it and by moving the galaxy it moves the various solar systems, the black hole is therefore the death of a star but at the same time it is a generator of universal life! What do you think about it?

Black hole, definition and study.

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Black hole, definition and study.

Black hole, definition and study.