black holes, but many people don’t know the structure of black holes.
Black hole is the strangest celestial body in the universe, but it is also a celestial body in essence. Each black hole contains two parts: the singularity and the event horizon.
Singularity is a dense small dot with infinite size and infinite mass and density. All the masses of black holes are concentrated on the singularity, so strictly speaking, all black holes are of the same size and are infinitely small singularity, and there is no difference except for different mass.
The main difference is the event horizon, what is the event horizon?
Because the black hole is very large in mass, it can swallow any object close to it, even light is no exception. Every black hole has such an area. Once any object passes through this area, it will be ruthlessly swallowed by going without returning. The edge of this area is the event horizon.
What we usually call the size of a black hole refers to the size of the event horizon.
The size of the event horizon is usually measured by Schwarzsie radius . The two are consistent. The radius of the event horizon is actually the Schwarzsie radius. The calculation formula of
is: R = 2GM / c²
G is a gravitational constant, which is very small. M is the mass of a black hole, and R is the Schwarzsey radius.
can be calculated according to the above formula. If the sun is compressed into a black hole, the sun's Schwarzsie radius is only about 3 kilometers, and the earth's Schwarzsie radius is about 9 mm, which is only the size of a glass sphere. The Schwarzsche radius of the moon is only 0.1 mm.
So what does a black hole with the size of atom look like? How big is the quality?
can be easily calculated according to the above formula. The mass of this atomic black hole is about 97 trillion tons, which is as much as twice the mass of Mount Everest.
With the mass of a black hole, it is easy to calculate the gravity generated by the black hole. Suppose this black hole is only 10 meters away from you, how big is the gravity?
According to the universal gravity calculation formula F = GMm/r², the final result is 6600 kilograms of force. Such a large gravity means that you will be torn apart very quickly and eventually become part of the black hole.
If this black hole falls on the ground, it will soon attract the surrounding matter, then fall into the core of the earth, and then swallow the entire earth, forming a larger black hole, but it is only the size of a glass bead.
But are there really such a tiny black holes in the universe?
It did exist at the beginning of the birth of the universe and was called the "Taichu black hole". This has a lot to do with the universe environment at that time. The temperature, density and pressure of the universe were very high at that time, so the Taichu black hole could exist.
Now, after 13.8 billion years of evolution, there is no environment for tiny black holes to exist. A black hole of atomic size will evaporate in an instant when it is placed in the universe.
Now the black holes that exist in the universe are most of the products of massive stars after the death of them, and the smallest black hole mass is about 4 times that of the sun !
