Can the black hole itself be seen, can the black hole be seen?

It is called a black hole because it cannot be observed with light or other forms of electromagnetic waves, and any light emitted into the black hole will be absorbed and not reflected back. Black holes are so "black" that humans can't directly observe them.

If it reflects light, it can be seen, it can not be reflected, and supermassive matter distorts space, so it is impossible to reflect.

I just came back from the black hole yesterday, it was so black that I couldn't see anything, and it was a round ball to the touch, which was quite slippery. I really can't see anything.

Look at the rotation speed of the planets around the black hole to determine the position of the black hole.

Doesn't it say that there is an accretion disk that emits light, and why have black holes never been observed?

Black holes are invisible, because black holes are distorted by space, and they absorb everything, including light, so they are invisible.

Yes, there is Hawking radiation, but it is lower than the microwave background and cannot be observed.

He distorted the space, and the light couldn't reach him. So can't be seen.

The black hole itself is not visible, but its presence can be detected by the bending of its gravitational pull on the background object, as shown in the figure below.

It can also be found by the high-energy rays and material jets generated by the absorption of the mass of the companion star by the black hole in a binary system, as shown in the figure below.

If it is a solitary black hole, if you illuminate it with a powerful light source, you can also see its shape, as shown in the figure below.

The light seen is actually the light used to illuminate the black hole, and it returns through the bending of the black hole's gravitational field. The black hole is right at the center of this image.

Black holes are invisible, intangible, and imitated, and astronomers mainly explore them through powerful X-ray sources in the black hole region.

Although the black hole itself cannot emit any light, its huge gravitational pull on surrounding objects and celestial bodies still exists. When the surrounding material is attracted by its strong gravitational pull and gradually falls towards the black hole, it emits powerful X-rays, forming an X-ray source in the sky. By searching for X-ray sources, people can find traces of black holes.

In 1916, the German astronomer Karl Schwarzschild calculated a vacuum solution to Einstein's gravitational field equation, which showed that if a large amount of matter is concentrated in a point in space, a strange phenomenon will occur around it, that is, there is an interface around the particle point - once the "event horizon" enters this interface, even light cannot escape. This "incredible celestial body" was named a "black hole" by the American physicist John Archibald Wheeler.

Black holes cannot be directly observed, but their existence and mass can be known indirectly, and their effects on other things can be observed. Information about the existence of a black hole can be obtained by using the "edge information" of the rays emitted by the high heat before the object is sucked in. The existence of black holes can also be inferred by indirect observation of the orbit of stars or interstellar clouds.

On December 7, 2017, scientists at the Carnegie Institute for Scientific Research in the United States discovered the most distant supermassive black hole ever recorded, with a mass 800 million times that of the Sun.