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Magical cosmic black hole

Magical cosmic black hole (Picture 1)

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Black holes are a kind of celestial body in the universe in modern general relativity. The gravity of a black hole is large, so that the escape velocity in the horizon is greater than the speed of light. Black hole is a kind of celestial body with a large density and a small size in the space of modern general relativity. A black hole is produced by a gravitational collapse caused by a star of sufficient mass to die after the fuel in the nuclear fusion reaction is exhausted. The gravity of the black hole is so great that even the light cannot escape. In fact, the black hole is not "black", but it cannot be directly observed, but its existence and quality can be learned indirectly, and its influence on other things is observed.

In 1916, the German astronomer Karl Schwarzschild calculated a vacuum solution of the Einstein gravitational field equation. This solution shows that if a large amount of matter is concentrated in space, it will produce strange phenomena around it. That is, there is an interface around the particle point-once the "vision" enters this interface, even light can't escape. This "unbelievable celestial body" was named "black hole" by American physicist John Archibald Wheeler. Hawking once pointed out through the paper that black holes do not exist in classical theory. He admits that his initial understanding of horizons is flawed and proposed a new "grey hole" theory. The theory holds that matter and energy are trapped in the black hole for a while and then re-released into the universe.

Scientists believe that there are supermassive black holes in the center of all large galaxies. Black holes have been consuming the substances known as "active galaxies." The quality of the black hole is difficult to determine because it is surrounded by a bright and extremely high temperature falling material disk. A black hole cannot be directly observed, but its existence and quality can be learned indirectly, and its influence on other things is observed. The message of the existence of a black hole can be obtained by releasing the "edge message" of the gamma ray due to high heat before the object is inhaled. It is speculated that the existence of black holes can also obtain the position and quality by indirect observation of the trajectory of the star or interstellar air mass. On December 7, 2017, scientists at the Carnegie Institute of Science in the United States discovered the farthest supermassive black hole in history, with a mass of 800 million times that of the Sun.

The black hole will shine brightly, the volume will shrink, and even explode, it will spray objects and make a dazzling light. When the British physicist Stephen William Hawking made this prediction in 1974, the entire scientific community shook. Hawking's theory is a leap of inspiration-oriented thinking. He combines general relativity and quantum theory. He finds that the gravitational field around the black hole releases energy while consuming the energy and quality of the black hole. As the quality of the black hole gets smaller, its temperature will get higher and higher. Thus, when a black hole loses mass, its temperature and emissivity increase, and thus its mass loss is faster. This "Hawking radiation" is negligible for most black holes because the large black holes radiate more slowly, while the small black holes radiate energy at very high speeds until the black hole explodes.

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