From the moment he stepped out of the portal, a force of gravity that Chen Yu could not detect, but was real, dragged him forward.

But as he started the quantum engine, the drag was canceled out.

"According to the data inside the helmet, I am now traveling at 1,020 meters per second, and the black hole 7,000 kilometers away does not pose a threat to me at all. And the engine pressure is only 75% at this point, which means that even if I go some further distance, I can easily escape. ”

"But for the sake of safety, let's set this boundary, not wave. ”

As he spoke, Chen Yu pulled the engine pressure up by 10% and flew in one direction at a slow speed.

"According to common sense, black holes without accretion disks are indeed invisible. But I have a way to let people see the existence of black holes with their own eyes. ”

"It's just that this approach requires a special angle. ”

"So before looking for this angle, by the way, to some viewers in front of the screen who don't know anything about astronomy, black holes, what is it. ”

Facing the camera, Chen Yu recalled the copywriting he had memorized in advance, and said soothingly: "A black hole, simply put, is a product compressed from a mass of matter to the extreme. ”

"A cat, squeezed by a hydraulic press, becomes very thin. If there is a magical hydraulic press that can compress this cat to a few nanometers, crush every molecule of its hair, flesh, bones, and nerves into neutrons, and then crush neutrons into atoms, and finally crush atoms to ......"

"None of the atoms that make up this cat are there, but its weight is still there. ”

"So, this cat has become a black hole with infinite mass. ”

[Cat: Meow?]

[Terrible parables.] 】

[True, easy to understand.] 】

[My husband has a lot of knowledge!]

[My husband is so big!]

【Really Big +1】

[I understand the truth, that is, where to buy this hydraulic press?]

[Have you all forgotten that the theme of this live broadcast is human catastrophe?]

[I didn't forget, but I just wanted to call 666......]

【6666......】

His hands were covered by armor, and Chen Yu couldn't see the barrage of the audience, so he continued to explain by himself.

"Of course, it's impossible for a cat to collapse into a black hole. In the universe, the only stars that can collapse into black holes, such as the Sun, are generally the only ones that can collapse into black holes. ”

"If our sun is dozens of times larger and becomes a super-large star, when its internal nuclear fusion fuel is exhausted, the huge shell will collapse inward, and under the drag of gravity, crush molecules, neutrons, and atoms...... Eventually it becomes a black hole. ”

"That's where most black holes in the universe come from. ”

Chen Yu's voice paused for a moment, waiting for the audience to finish digesting, and then spoke: "Many people will wonder, how did this kind of thing be discovered by humans? ”

In 1916, Albert Einstein officially published his theory of relativity, and the whole world fell to their knees. At this time, Schwarzschild held the theory of relativity, and when calculating the gravitational field equation, he came up with a 'vacuum solution'. This solution shows that if a large amount of matter is gathered at a point, there will be a visual interface around that point. And once in the viewport, nothing can escape, including light. ”

"The existence of incredible celestial objects in this theory was called a black hole by physicist Wheeler. ”

Its existence was completely beyond the scope of understanding of the academic community at that time, and many scholars did not want to believe it. But Einstein's theory of general relativity is again valid. Unless the theory of relativity is wrong, black holes must exist. ”

"Everyone knows what happened next. ”

Chen Yu gave a thumbs up: "Through gravitational redshift and gravitational lensing, the black hole has been proved." ”

【666！】

【6666......】

[Young Zhuang doesn't work hard, the boss is 666. 】

[Eye-opening. 】

[Einstein's father's thighs are so thick. 】

[What's that white hole?]

[The white hole needs to be made by hand, a bottle of hair removal cream and a razor are enough. 】

【(; ￢＿￢)】

[The old driver took me, I want to go to the provincial capital ......]

"Black holes are scary. Chen Yu glanced at the change in the gravitational value in the helmet, and said solemnly: "As long as you enter that visual interface, you will be torn apart by the atomic level of the terrifying gravity, and only pure energy will remain." Ant-Man can't even bear it. ”

"Hmm...... As for the origin and history of black holes, this is a brief point here. I'm not far from that 'point'. At the end of the day, I will tell you about some more interests. ”

"Black holes, there are only three basic quantities. Mass, angular momentum, and charge. Mass is weight, angular momentum is rotation, and charge is whether a black hole is charged or not. ”

"Therefore, in the academic world, referring to these three fundamental quantities, black holes will be divided into four properties according to whether they are rotating and whether they are charged, in the form of Cartesian products: Schwarzschild black holes, r-n black holes, Kerr black holes, and Cole Newman black holes."

"But this division of nature is too professional, and some viewers can't understand it, so I use the perspective of 'ordinary people' and simply classify it by size. ”

After that, Chen Yu faced the camera and stretched out three fingers.

"Small black holes, stellar black holes, super-large black holes!"

"Let's start with a super-large black hole, which has an incredible mass and can even drive a river system to rotate. For example, the Sagittarius A black hole in the middle of the Milky Way galaxy has a mass of the sun, note that it is not the earth, it is 4.3 million times that of the sun!"

"The Andromeda galaxy next door to the Milky Way, the mass of the black hole in the center is 33 million times that of the Sun!"

"Straw Hat Galaxy, central black hole, billion 20 million times!"

"Last year we saw a black hole in the photo.7 central black hole, 6.5 billion times. ”

"ton 618, 66.6 billion times the mass of the sun, Schwarzschild alone has a diameter of 384 billion kilometers......"

When the words fell, Chen Yu couldn't help but sigh: "This is the universe, the more you understand, the more you find yourself small." ”

"As for stellar black holes, as I said before, black holes formed by the collapse of stars are generally about dozens of times the mass of the sun. Skip. ”

"And this black hole that our solar system broke into is a small primordial black hole. It is only 125 times the mass of the Earth, and it collapsed during the Big Bang, when the matter was extremely dense. ”

"According to Hawking's radiation theory, a black hole will slowly radiate particles outward. If there is no food, the black hole evaporates, leaving only a permanent, Plante-length remnant. But the process is quite long. ”

In other words, the cave 7,000 kilometers away from me is already 13.7 billion years old. It witnessed the moment of the Big Bang. ”

【Shocking ......】

[Compared to the universe, the earth is like a bacterium. 】

[The ancients thought that the universe revolved around the earth.2333] 】

[I've been paying attention to the anchor since the first evaluation, and I know so much!

Don't you know what copywriting is?

[M! The anchor has no copywriting, it's awesome!]

[The anchor is awesome!]

【T+1】

[Do you know how hard my anchor works?]

[I can't tell if it's black or pink for a while......]

"It's here. ”

After continuing to fly for another five minutes, Chen Yu's figure suddenly paused, and he opened his arms: "This is the position." ”

"As we all know, under the gravitational pull of a black hole, even light cannot escape. But what about the rays that are close to beyond the event horizon of the black hole?"

"It's going to be distorted. ”

This phenomenon is called gravitational lensing. ”

"Then let's make a bold assumption......"

"If you look at the sun through a black hole...... What will happen?"

Chen Yu clasped his hands together, and his tone gradually became excited: "The light in the middle will disappear, and the light in the four circles will be distorted." In this way, we can see the existence of black holes with our own eyes through the distortion of light!"

"The gravitational pull that can suck away light particles has become the culprit of exposing it!"

【?!】

[It seems to make sense......]

[The legendary Einstein ring!]

【Divine Thought ......】

[**Exploded.] 】

【Awesome!】

[Mom asked me why I was turning over my head to watch the video.] 】

[This wave of operations is really ......]

[Show.] 】

[I still wonder how I can see it, it turns out that this is ......]

"And I'm in a straight line beyond the black hole and the sun. ”

"So now, count down to three seconds......"

Chen Yu slowly turned the camera: "Let's witness the true form of the black hole together!"

"Three. ”

"II. ”

"One!"