A black hole is a celestial body with an extremely strong gravitational field and is also the densest celestial body in the universe.

The largest black hole discovered by humans so far has a mass of 66 billion times that of the sun. It is located at the center of quasar TON618, 10.4 billion light-years away from the earth.

According to Hawking's speculation, there is a singularity at the center of the black hole, which has an infinitely small volume, an infinitely high density, and an infinitely high curvature of space-time.

There is a horizon around the black hole. Because the gravity of the black hole is extremely strong, the escape velocity within the horizon is greater than the speed of light. However, no object in the universe can move faster than the speed of light, which means that the black hole can swallow all matter that falls within the horizon.

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Black holes are not picky eaters at all. Whether they are planets, stars, or neutron stars, they are just delicacies in front of the black hole.

Moreover, the heavy black hole basically only eats but does not poop. He only eats more and gets fatter and eats harder and harder.

Only those small-mass micro black holes will lose weight and evaporate in a short time.

For this reason, scientists have divided black holes into different grades according to their weight, namely, micro black holes: This is an extremely tiny black hole, also called a quantum black hole or a mini black hole. Theoretically, the lower limit of the black hole's mass is

Langcian mass (2.18 10^-8 kg).

Because they are quantum-level black holes, they are very different from ordinary black holes.

Although micro-black holes have not yet been discovered, scientists believe they exist.

Stellar black hole: This is what we usually call a black hole, with a mass equal to that of a star.

When a star is dying and the remaining core mass is greater than three times the mass of the sun, it will collapse into a stellar black hole.

Intermediate mass black hole: The mass is generally between 100 and 100,000 times the mass of the sun.

According to relevant theories, this kind of black hole is generally the level reached by a stellar-level black hole after eating too much and gaining weight. Surprisingly, scientists have only found a small number of such black holes in the universe.

Supermassive black hole: It is a black hole with a mass of more than 100,000 times the mass of the sun, with no upper limit in mass.

This kind of black hole is usually located at the center of a galaxy and is crucial to the formation of galaxies.

There is a supermassive black hole at the center of the Milky Way.

The black hole in TON 618 is a supermassive black hole.

Black holes are usually the result of the gravitational collapse of celestial bodies. Massive stars will become black holes after their death.

However, supermassive black holes such as TON 618 are not directly formed by the collapse of stars, but grow by continuously swallowing other matter and merging with other black holes.

The greater the mass of the black hole, the stronger its gravitational field and the larger the event horizon radius.

The event horizon radius of the black hole in TON 618 has reached 192 billion kilometers, which is about 27,600 times the radius of the sun (696,000 kilometers).

In terms of volume, it is 4.2 million times larger than UY Scutum, the largest known star in the universe.

According to scientists' speculation, quasars are supermassive black holes in the centers of active galactic nuclei, and their bright light comes from the light released by the accretion disks of these black holes.

Without an accretion disk, a black hole would become an invisible object.

Quasar TON 618 is one of the brightest objects in the universe. Its luminosity is 140 trillion times that of the sun, so we can see it from more than 10 billion light-years away.

Although quasars are much smaller than galaxies, they release thousands of times more energy than galaxies, so they are very bright.

The reason for this is that there is a supermassive black hole at the center of TON618.

Because the black hole is so massive, it has an accretion disk about a light-year across.

The accretion disk is formed when the material around the black hole is attracted by the strong gravity of the black hole, torn apart, and moves around the black hole at high speed, releasing huge amounts of energy in the process.

Although TON 618 is extremely huge, even if it is given enough time, its mass cannot increase indefinitely, and at most it will swallow up the entire galaxy where it is located.

Because the expansion of the universe is accelerating, galaxies are not only far apart but also moving away from each other.

But even so, the black hole is still the most terrifying existence known in the universe.