About Black hole theory - Summury
Black holes are known as substances that absorb everything in the space.
A black hole is the weirdest object in the universe. An object that passes behind it appears strongly distorted because of the black hole's influence on light propagation. Turn your smartphone or tablet into a general relativistic simulator and move the black hole around.
A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon. Although the event horizon has an enormous effect on the fate and circumstances of an object crossing it, according to general relativity it has no locally detectable features.
In many ways, a black hole acts like an ideal black body, as it reflects no light. Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe.
Black holes are points in space that are so dense they create deep gravity sinks. Beyond a certain region, not even light can escape the powerful tug of a black hole's gravity. And anything that ventures too close is its star, planet, or spacecraft will be stretched and compressed like putty in a theoretical process aptly known as spaghettification.
Quantum mechanics provides another way for particles to escape a black hole. According to theory, pairs of subatomic particles are constantly blinking in and out of existence around a black hole's event horizon. Every so often, the configuration is aligned in just the right way to cause one of the partners to fall into the black hole. The particle's identical associate is then propelled away at extremely high speed, robbing the black hole of a tiny bit of energy.
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