What is a black hole?
An absolutely incredible concept - a black hole, was described and published by Einstein in his theory of relativity. Only recently have scientists received more or less reliable evidence of the existence of black holes. What is a black hole? This is a celestial body with certain properties.
- It is small - the diameter of a black hole is about 20 kilometers (although it is believed that there are similar objects and large sizes)
- Very tight. Its density is inversely proportional to the size, the larger the hole - the less its density
- A black hole does not reflect light, because its attraction is so large that even the photons of light cannot leave it. Therefore, it can not be seen
- This object draws into itself everything that approaches it at a critical distance.
In order to develop and describe the properties of a black hole further, one should use the main postulates of the general theory of relativity. According to her, each body pushes, crushes the space around it. Since the black hole has a huge mass, it, like a heavy ball on a soft and elastic surface, falls through and forms a hole.So, the harder this ball is, the smaller will be the external diameter of this pit, which sooner or later will close its edges. Thus, it will cease to exist, that is, to be visible from the outside.
Since people cannot see a black hole, they determine its presence by indirect signs. For example, according to the force of gravity near it and the special properties of the matter that comes into contact with it.
Whats inside black hole
Without seeing the object itself, it is even more difficult to say what is inside it. If we set aside the crazy and fantastic theories that a black hole bends time and juggles with captured objects in time, then it is worth remembering that we talked about it earlier. The word "hole" does not quite reflect the essence of the object. After all, in fact, this body, superdense substance.
Once upon a time, a black hole was a star that exhausted its supply of fuel and, as a result of a collapse, shrank to a point. Many physicists and astrophysicists think so. According to this theory, in the center of a black hole there is an area in which all the matter of the former star collapses. This area is called a singularity. But there is another area surrounding this point, it is limited by the horizon of events. If a space object falls beyond the event horizon, it will not be able to return.
We cannot get information that is inside the black hole, because if it is possible to get into it, then it is impossible to return. That is why this space object received the definition of “black”. Scientists have so far failed to come to a general decision on what a black hole is. That is, there are several areas of physical reasoning, which are based on indirect facts.
The study of black holes, basically, is the study of how cosmic bodies move and change, which fall into their zone of action. Everything else is just speculation and theories that cannot be proved and verified.