In the pitch-black classroom, a voice of surprise suddenly sounded.

At this moment, in front of everyone, a strange image appeared on the white curtain.

It was a dark red three-dimensional double ring, the color resembled a furnace fire in a coal furnace, and in the middle of the double ring, it was pitch black.

If you insist on using an item as an analogy, it may be somewhat similar to the "doughnuts" that everyone usually eats.

That's right!

This image is the three-dimensional image of the "black hole" jointly issued by the top astronomical institutions of several major countries in the future.

Speaking of black holes, which are "hot" stars in astrophysics, in fact, they have been studied by physicists and astronomers as early as the 19th century, and in the early 20th century, with the theoretical support of Einstein and other physicists, "black holes" gradually became clear.

But there has been no conclusion as to what a "black hole" looks like.

Most of the conjectures about black holes are portrayed through sides, such as "gravitational waves".

It can be seen that the scientific community still has a vague understanding of black holes.

"Ahem...... Everyone must be wondering, what the hell is this image of mine, right? Just when everyone was puzzled, He Yun suddenly spoke.

However, when he said this, he didn't explain too much, but after saying a word, he couldn't help but flick it again, and soon, the slide changed again, and this time, a third image appeared on the white screen.

This is a very different image from the previous two.

Two black spheres appear on the image, and around the spheres are a dim yellow halo, and around these rings, a spiral-shaped three-dimensional white band of light appears, somewhat similar to the ripples of water splashing.

"Let's take a look at this one again, this is my diagram of gravitational waves between two stars based on Mr. Einstein's general theory of relativity, so what are gravitational waves? In fact, very simply, gravitational waves refer to ripples in the bend of space-time, propagating outward from the radiation source in the form of waves, which transmit energy in the form of gravitational radiation. ”

He Yun explained the image in front of him in words that everyone could understand, but even so, most of the students present were in a fog.

Even Professor Liu and Professor Wang Furen, who stood in the back row, were the same.

But a young teacher who was standing against the door at the moment was thoughtful.

His name is He Xiangtao, and he is a lecturer in the Department of Astronomy at Kyoto Normal University.

"Interesting? Gravitational waves? He Xiangtao looked at the image presented on the white screen, a smile appeared on his face, and he couldn't help muttering.

After a moment, he glanced at He Yun who was standing next to the slide projector.

At this time, He Yun dialed back the slide again: "Let's talk about gravitational waves, then let's talk about the image in front of us, what is this image?" I think you've probably heard of it, and it's my vision of a black hole, one of the most mysterious of all celestial bodies. ”

"So what is a black hole? A black hole is a special kind of celestial body that has a strong gravitational pull that allows it to escape faster than the speed of light in its event horizon. And if two black holes happen to collide and merge, theoretically they can produce ripples in space-time, and gravitational waves can be generated at this time......"

Well, although He Yun is not an astrophysicist, he has worked hard for this lesson, not only let people draw these thirty drawings in advance, but also deliberately went to the school library to check a lot of astrophysics materials related to it, even quantum mechanics and Einstein's general theory of relativity.

And just when He Yun was talking about these theoretical knowledge, at this moment, Professor Wang Furen smiled and said to Professor Liu, who was standing on the side: "This kid is really good!" I think these things are only for astrophysics students, right? He, a lecturer in the Chinese department, is so familiar with these things, if people who don't know about it, I'm afraid they will think that this is a class in the astrophysics department. ”

"Hahaha. ..... I'll just say this kid is amazing, you still don't believe it! Now I believe it! Professor Liu couldn't help but smile and replied.

"Ahem...... Well, I'm willing to gamble! Lao Liu, you won this time! Professor Wang Furen smiled wryly and then said.

..........

In the following time, He Yun gave everyone another seven or eight special celestial phenomena and celestial concepts, and then he changed his words, and then said: "The reason why I give you these things today is not to let you go to the graduate school of astronomy or physics, but to tell you that science fiction is not only imaginative, but also brainstorming and dabbling, just like what I said today, all have to .........."

"Okay, after talking about the macrocosm, let's talk about the microscopic world, everyone should know that the atom is composed of atomic nuclei and charged electrons, and the atomic nucleus is composed of protons and neutrons, and protons and neutrons are composed of quarks, which can be seen that quarks are the smallest units of particles in the universe, but in fact, the energy of electrons can be quantized by quantum, that is, quantum is the smallest unit that can show the characteristics of a certain substance or physical quantity, which extends quantum mechanics and quantum optics..........”

As He Yun narrated, the slides began to change one after another, bringing a different microcosm to the students.

And time is also in his narration, slowly passing, and soon, the time for class to end is up.

It was also at this time that He Yun finished the last slide.

After closing the slides, he instructed the students by the window, "Okay, the students by the window can open the curtains!" ”

"Huh!"

"Huh"

After the curtains were slowly torn open, the dazzling sunlight from outside instantly shone into the classroom, which made everyone can't help but squint slightly.

After a while, everyone got used to the brightness of the classroom, but found that He Yun had already stood on the podium.

He glanced at everyone, and his eyes were on Professor Liu and Professor Wang Furen, who were standing in the back row, and stopped for a moment, and then said: "Just now, I introduced the macrocosm and the microcosm world to you, and also popularized many magical phenomena. ”

Speaking of this, He Yun immediately picked up a sketch from the textbook, and said with a smile: "This is a sketch, I just took a look, it was created by Liu Yueyang, a student of the Chinese Department, and what he created should be a hotel, through this sketch, we can see that the deceased is lying on the ground, with a knife in his back, the doors and windows are closed, and there is no exit, and next to the sketch, there is also a line of introduction, which is the narration of the design of this murder room, I will read it to you......."

"After the hotel waiter pushed the door into the room, he found the deceased lying on the ground, the deceased was stabbed in the back, and blood flowed all over the ground, and soon, the waiter called the police, and the police concluded through the forensic autopsy report that the deceased died at one o'clock in the morning last night, and the cause of death was the death of excessive blood loss from the knife in the back, three inches deep and one inch wide, which was caused by the stabbing of a sharp weapon such as a fruit knife.

........

He Yun spent a few minutes and selected the after-class homework of three classmates to read to everyone, and finally he saw that the class was over, so he said: "Because of the relationship of time, I will not read the homework of other students here to you one by one, and in the next class, I will bind these homework into a book, if you want to read it, you can come to me to borrow it." ”

"Alright, now I'm announcing the end of class!"

As soon as He Yun's words fell, under the podium, some students muttered quietly.

"What's going on? In today's class, Mr. He didn't assign homework? ”

"You stupid! Didn't Mr. He say it all, isn't it too late? ”

"Ahem..... Everyone's attention is a little off, haven't you noticed that today's class taught by Teacher He and what Teacher Wu Yan talked about are completely in two directions? ”

"Huh.....? What you said is true, Mr. Wu Yan's class discusses science fiction from domestic and foreign science fiction works, while Mr. He Yun's class discusses science fiction from astrophysics and microphysics, which are indeed two different perspectives. ”

.......

In the classroom, students gathered in groups of three or five, and they walked out of the classroom while talking.

At this time, as soon as He Yun came out of the classroom, he saw Professor Liu and Professor Wang Furen coming over.

"You kid! ...... Unexpected! I really didn't expect it! At your level, you can go directly to the Department of Astronomy to become a professor! Professor Liu patted He Yun on the shoulder and couldn't help but smile and said.

"Ahem...... Professor! You think too highly of me, don't you? I'm fooling a layman with this little thing at best, how can I compare to those professors in the astronomy department. He Yun is not modest, he knows that he has a few catties and a few taels.

"No, no, no! Mr. He, I think you have a deep research in astrophysics. In particular, your hypothetical diagrams, such as black holes and gravitational waves, are some of the most cutting-edge research directions in astrophysics. ”

As soon as he finished speaking, he saw a young man wearing glasses walking over slowly.

He is none other than He Xiangtao, a lecturer in the Department of Astronomy.

Just now, he had listened to He Yun's public elective course, and in his eyes, He Yun could no longer be called an astrophysics enthusiast, but a senior researcher of astrophysics.

"Hello! Prof. Wang, Prof. Liu, my name is He Xiangtao, and I am a lecturer in the Department of Astronomy. ”

"Hello! Mr. He! ”

Although Professor Liu and the others have not met He Xiangtao, they have heard of the name of He Xiangtao, a young lecturer who was awarded the title of Advanced Science and Technology Worker in National Colleges and Universities by the State Science and Technology Commission and the State Education Commission two years ago, and was also awarded the title of Young and Middle-aged Experts with Outstanding Contributions by the State in 1984.

How could they not have heard of such a "man of the hour".

It's He Yun, because he just came to Kyoto Normal University, so he doesn't know He Xiangtao in front of him.

However, what he didn't expect was that He Xiangtao's next words almost made him angry.

"Hello Mr. He, are you interested in opening a public elective course in our astronomy department?" He Xiangtao looked at He Yun and said with a smile.

"Uh..... Mr. He, what are you talking about? When He Yun heard this, he was stunned.

Let me go to the Department of Astronomy to open a public elective course, you might as well spare me!

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