What do the black hole pictures prove?

On the evening of April 10th, Beijing time, it was released simultaneously in many places around the world. The world's first "real" black hole photos were revealed. The black hole images revealed the black hole at the center of the supermassive galaxy M87 in the Virgo Galaxy Cluster, which is 5500. The shadow photo of the black hole of the supermassive black hole at the center of the massive galaxy M87 10,000 light years away has a mass 6.5 billion times that of the Sun and is also direct "visual" evidence of the existence of the black hole.

1. Is the first photo of a black hole in humans

The concept of a black hole was mentioned a long time ago by many physicists like Einstein and Hawking, this time I finally got a picture of it.

2. Simultaneous publication in six locations worldwide

Good things really want everyone to share ...

3. More than 200 researchers from all over the world participated and more than ten from China

Where there is success, there is China!

4. Direct long exposure for 10 days

I'm afraid it will take the longest to take pictures ...

5. The development of black hole photos took two years

The photo developing time should also be the longest ...

6. Einstein was right again

Once again astonished by Einstein's brain, the greatest physicist deserves his name.

7. Unfortunately, Mr. Hawking has not seen

Although Mr. Hawking did not see it, it is believed that he has already freed himself from the limitation of physical paralysis and traveled the universe.

what is a black hole?

A black hole is an extreme celestial body that is theoretically predicted. They have an extremely strong gravitational force. When they approach a certain distance, nothing can escape, not even the fastest light in the universe. This inescapable range of distances can be viewed as the limit of the black hole that scientists refer to as the "event horizon". From the outside, a black hole is a black "bottomless hole" in the universe that can swallow anything that accidentally approaches it.

Are there really black holes?

Astronomers generally believe that black holes are real. Compress the sun to a radius of 3 kilometers and it becomes a black hole. Of course, the sun cannot be compressed to such a small size because it is not heavy enough. A more massive star will collapse under its own gravity after it runs out of fuel, which can compress the core into a black hole. Astronomers also discovered that at the center of almost every galaxy there is a supermassive black hole, the mass of which is more than a hundred thousand times that of the Sun and can even reach ten billion times.

How was the black hole so dark?

The black hole itself is black and does not emit light, but the periphery of the black hole is not necessarily. When there is other matter around them, it is attracted to the black hole and collects in disks around them, spinning at high speed, rubbing against each other and getting extremely hot. This "incandescent" matter emits bright light and even becomes the brightest light source in the universe. By observing these bright lights, astronomers have confirmed and discovered many black holes in the universe. In addition, through gravitational waves, astronomers have observed several events in which black holes merged into one. Ultimately, however, these are only indirect observations that do not see the black hole itself directly.

How can you see the black hole for yourself?

In theory, black holes can be seen directly. In the bright light emitted by the surrounding matter, the black hole absorbs all light that is too close to it, leaving a clear black silhouette. In reality, however, this silhouette can hardly be seen. The reason is simple, the black hole is too small! Even the oversized black hole at the center of the Milky Way has a mass 4 million times that of the Sun, and its silhouette is a few dozen times the diameter of the Sun at best, and its distance from Earth is 25,000 light years . For example, if we want to see the silhouette of this black hole, we must have excellent vision and the ability to see a tennis ball on the lunar surface clearly on earth.

Do people have such a super vision?

If humans have a very large telescope with a diameter equal to the diameter of the Earth, that telescope has theoretically enough resolution to be able to vaguely see the silhouette of the super large black hole in the center of the Milky Way. Unfortunately, it is impossible for us to turn the entire earth into a telescope. However, a black technology known as "very long baseline interference" enables astronomers to unite multiple radio telescopes scattered around the world to simultaneously observe the same target and eventually reach the size of the earth. The resolving power of the telescope.

Did the astronomers do that?

Astronomers did just that. They combined 8 radio telescopes, which are scattered in Europe, North America, South America, the Pacific and Antarctica, into an "Event Horizon Telescope" the size of the earth. In April 2017 and April 2018 joint observations were made on the super large black hole in the center of the Milky Way and another super large black hole in the center of the M87 galaxy 50 million light years away. Although the latter is farther away, its mass is about 6 billion times that of the Sun, so it appears to be about the size of the super-large black hole at the center of the Milky Way.