Sihai network

What does the first picture of a black hole show? How are black hole photos taken?

On April 10, 2019, the first photo of a black hole was released in Shanghai. At 9:07 p.m. on April 10, Beijing time, a global press conference was held in six places around the world through coordination. The first black hole photo of mankind was released simultaneously in six places around the world. What does this black hole picture show? How are black hole photos taken?

On the same day, the third floor of the astronomical building of the Shanghai Observatory of the Chinese Academy of Sciences released the first picture of a black hole.

'the picture we see now has two parts, strictly speaking, two structures. Yuan Feng, a researcher at the Shanghai Observatory of the Chinese Academy of Sciences, said at the scene that part of the shadow is not very luminous in the central area, and the other part is a bright ring around the shadow. The light from the circular ring is emitted from the accretion disk, and the black shadow is several times larger than the black hole itself, which confirms the prediction of Einstein's general relativity.

According to Yuan Feng, the black hole in the picture is more than 50 million light-years away from the earth, and the picture shows its appearance more than 50 million years ago. The space around the black hole is curved. The black hole itself is invisible. Put the black hole in the background of light emission, and this is the picture you see. 'the light ring you see now is the structure you get when the light is twisted. If you don't twist it, you won't see such an image. 'he said.

'theory and observation are mutually reinforcing. "For the time being, this picture validates Einstein's general theory of relativity, and subsequent observations will solve some problems that have not yet been clarified," he said.