The universe is full of whirlpools like rivers, lakes and seas, is a black hole a whirlpool?

That's right, black holes are the vortex of the universe. Because a black hole has a great gravitational pull and the density inside it is very large. So after being caught in a black hole, you basically can't get out.

Indeed, if the universe is compared to a horizontal plane, a black hole is like a vortex in it, due to the huge gravitational pull caused by its huge mass, which pushes the horizontal plane into a funnel-shaped vortex that is sucked into it by objects that come close to it.

A black hole can be said to be a kind of vortex, but it is not really a vortex, but because of the collapse of celestial bodies, which causes the formation of black holes, which attract surrounding light and all nearby objects.

Personally, I think it's a vortex, and humans can't see the back or side of the vortex yet.

A black hole is formed when a massive star gravitationally collapses through a supernova explosion (a stellar black hole), or when the center of a galaxy shrinks gravitationally (a massive black hole at the center of a galaxy).

Stars and galaxies are all rotating and have a rotation. During gravitational contraction, because angular momentum is conserved, black holes also "inherit" the angular momentum of the original star or galaxy itself when they are formed, so the black hole also rotates. When a black hole rotates, it will cause the surrounding space to rotate as well, and the matter or planet that enters this rotating space will also rotate with the rotating space.

Since this is the rotation of space itself, no matter or planet can get rid of it, as if entering a great vortex.

So, around the black hole, there is a black hole vortex. Actually, it's the rotation of the space itself.

【Introduction to Black Holes】 A particularly dense dark object predicted by general relativity. Massive stars collapse at the end of their evolution, and their matter is so dense that it has a closed boundary called the "event horizon", and the black hole hides a huge gravitational field that is so strong that any matter, including photons, can only enter and cannot escape. The lower limit of the mass of the nucleus of the formation of a black hole is about 3 times the mass of the sun, which, of course, is the mass of the last nucleus, not the mass of the star in the main sequence period.

In addition to this stellar black hole, there are other black holes - the so-called miniature black holes may have formed in the early universe, and the so-called supermassive black holes may exist in galaxies**. (Reference: New Horizons of the Universe) Black holes do not allow anything within their boundaries to be seen by the outside world, which is why such objects are called "black holes".

We cannot observe it through the reflection of light, we can only know about the black hole indirectly through the surrounding objects affected by it. That being said, black holes have their boundaries, namely event horizons (event horizons) that are speculated to be remnants of dead stars that are created when a special massive supergiant collapses and contracts. In addition, a black hole must be formed by a star with a mass greater than the Chandrasekhar limit at the end of its evolution, and a star with a mass smaller than the Chandrasekhar limit cannot form a black hole (see also:

A Brief History of Time - Stephen Hawking)