"Aliens exist, yes, they exist."

"Alien civilizations are not as powerful as we imagined, they are weak and have not yet developed technology, and some have not yet broken free from the shackles of the planet and walked to the starry sky.

They are also more powerful than us, they can travel interstellarly, they can travel faster than light. ”

"We haven't found them before, and it's a low-level civilization that can only use electromagnetic waves for communication and detection.

After these electromagnetic waves have experienced a long light-year scale, after the interference attenuation of interstellar dust, interstellar gas clusters and distances, the information contained in them has been completely lost and has become a clutter.

So we can't see them, and they don't know us. ”

"What really confirmed the suspicious traces of aliens was that after the two large gravitational-wave observatories of the Tomorrow Group were assembled and debugged in space, our gravitational-wave observatories detected a large number of abnormal gravitational wave signals from space.

Some of these signals are fleeting, and some have a certain length and regularity like communication waves. ”

Lu Yi tapped his finger on the laptop, revealing several detected gravitational wave band maps.

"The first alien civilization that our humans came into contact with was the Martian Muba civilization, which died out 4 billion years ago, leaving only the seeds of civilization to inherit."

A photo image of the Muba people appeared on the screen, and the students who were listening to it with relish suddenly couldn't help but exclaim.

"Tree Man!"

"Groot!"

"The shepherds are not groot, they do not control trees and are friendly to other species, but they are also executioners of animals and plants."

Lu Yi smiled, switched to an aerial view of the city and wilderness of the modern Muba, and explained: "This is a producer of intelligent life, and students who have a certain understanding of the biosphere and biological chain should understand what disaster a producer will bring about when he becomes an intelligent life."

It turns out that after the Muba people developed into a modern civilization, there were no animals, no insects, and extremely scarce vegetation on Mars.

According to the statistics of the Muba people, during their modern civilization, the microbial population on Mars was not counted, and the rest of the animals, plants, insects, mosses, ferns and other species combined were only 395 species.

The analysis of the relevant evolutionary process of the Muba people, as well as the evolutionary process of the species, will be given to you by your teacher of species evolution. ”

"Everyone knows about the second extraterrestrial civilization that humans came into contact with...... It's a blue man. ”

As soon as the blue man came out, the atmosphere in the classroom suddenly became silent and solemn, and some students with more emotions turned red.

Lu Yi did not mean to comfort these students, and then said: "This is an aquatic intelligent life, even if it has developed into modern civilization, it has not been separated from the aquatic environment.

We humans have dissected the corpses of two blue people, and we have obtained the evolution information of each other's species from the characteristics of each other's physiological organs and genetic maps, but the development process of the other party's civilization is not yet known.

How can an aquatic life smelt steel and develop a modern civilization to the stars? This is a topic worth studying, and you can write a paper at the end of this semester, and one day we will reach the home planet of the blue people and reveal the answer. ”

"Teacher, I have a question." A student with reddened eyes suddenly stood up.

"Li Jiahao, excuse me."

"Why are the blue people attacking us? Where is their home planet? ”

There was a strong hatred in Mr. Lee's eyes as he asked the question, having lost his sister in a flood caused by a torrential rainstorm in the midst of a catastrophe caused by increased solar activity.

"Why are you attacking us This is the top secret information of human beings, and when you graduate and meet the requirements, you will naturally know.

As for where the home planet of the blue people is, you can apply for a high-definition optical telescope with the school at night, and you should be able to see the stellar light of the other party's home galaxy.

This is the Northern Hemisphere, and the relative position of the Blue Earth parent star is 9.71° eastward in Sirius, 43.25 light-years from Earth. ”

Lu Yi's voice didn't have too many ups and downs, and after speaking, he temporarily turned off the video teaching system, and his expression swept over the 100 interstellar students present, and finally fixed on Li Jiahao, and said calmly and unquestionably:

"I understand that you may have friends or relatives who had an accident during the disaster caused by the blue people's attack on the sun, and they have hatred for the blue people in their hearts.

But I hope you can understand a truth, this is an interstellar major, in the future, you are responsible for human beings' analysis and suggestions to aliens, and any of your words and deeds may determine the resolution of human beings on aliens, and determine the life and death of human beings.

The interstellar world is much darker than you think, and any decisions and actions made by human beings on aliens cannot tolerate the slightest personal emotion or personal interest.

Your future may be the safety of humanity, putting aside your personal emotions and interests for a while, and thinking from a professional point of view from a data point of view.

This is a sentence written on the lesson, and it is also the first lesson you should learn, not half a month after the start of school, and I need to remind you here! ”

Lu Yi, who had read the information of all the students of the interstellar major, knew what the hatred in Li Jiahao's eyes was.

If the other party is a student of another major, he will comfort a few words, and may even use this hatred to guide the other party to work hard.

But this is an interstellar major, and the education cultivates the think tank talents in the alien plan in the future of mankind, and the words, deeds and suggestions of these students in the future may affect the resolution of human beings on aliens, so Lu Yi not only did not comfort him, but suppressed it.

Resolutions involving civilization do not tolerate personal interests, let alone personal emotions.

"I know there's something you can't accept in your hearts, and that's okay."

Lu Yi saw the pale faces and disbelief in the eyes of some students, including his own sister, but his expression did not change much, and continued: "If you can accept it, then continue to stay, and if you can't accept it, send me an application email after class, and I will coordinate and arrange for you to change majors." ”

"Now for the lecture...... Most of humanity's understanding of interstellar civilization is obtained from the blue people. ”

Lu Yi reopened the video teaching system and said: "In the cantilever area of Orion in the Milky Way, the number of civilizations that have escaped the shackles of the planet and gone to the starry sky is not as large as everyone imagined, at least it is still thin compared to the vast interstellar space.

Before revealing the answer to this question, I would like to ask, what do you think is the standard for dividing the civilization level in your heart? ”

"Teacher, I think it is more reasonable to divide the civilization level from the standard of energy consumption, from the energy output power of a planet, the energy output power of a star, and the energy output power of a galaxy."

A Russian student stood up and replied respectfully in a standard Russian attitude, while the intelligent teaching system simultaneously translated the Russian subtitles on the screen.

"Type I civilization, type II civilization, and the Kadashev scale of type III civilization, from the perspective of the universe to consider the consumption of energy to divide the civilization level, this is a more scientific division standard."

Lu Yi nodded and motioned for the Russian classmate to sit down, and said with a smile: "However, in practice, the span of this civilization level is too large, in order to distinguish it more conveniently, we can also divide the civilization level from the level of core technology."

Among them, the corresponding Type I civilization is the primitive civilization before modern technology, the first-level civilization that applies chemical energy and nuclear fission, the second-level civilization that has mastered controllable nuclear fusion, and the third-level civilization that has developed an energy shield through in-depth research on electromagnetic force.

Corresponding to the Type II civilization, the only Type II civilization we know at present is the fourth-level civilization that has mastered gravitational space-time technology and can travel with curvature beyond the speed of light.

We don't know about the higher existence of Type II civilizations, and there are only legends about powerful Type III civilizations.

In terms of big data, the level of civilization is gradually improving, but this is not a certainty.

At present, human beings correspond to a second-level civilization, and it is expected to become a third-level civilization within 20 years, but we are already increasing our investment in gravitational wave research, and it is possible to directly cross the third-level civilization to become a fourth-level civilization. ”

With the complete technology tree of the Muba civilization and the warship wreckage of the Blue Civilization, scientists within the human race predict that it will only take about 20 years for the human race to digest the technology on the Muba Civilization and the wreckage of the Blue Battleship, and break through to become a third-level civilization on this basis.

"This is also the main content of today's lesson, to determine the level of a civilization, we can analyze it from the perspective of core technology.

For example, if you see a nuclear fusion reactor, this is undoubtedly a second-level or third-level civilization, it cannot be a fourth-level civilization, and the energy engine of a fourth-level civilization is not a nuclear fusion reactor.

The energy output rate of nuclear fusion is too low for changing space-time.

Then, through the magnetic field data of the nuclear fusion reactor and the properties of the materials, we can further analyze how well the other party has studied the electromagnetic force and whether it has mastered the energy shield technology. ”

"Since we can analyze the other party's scientific and technological situation from the technology that has been shown, can we predict the general appearance of a more advanced civilization from the existing basic physical theory?"

"Einstein's general theory of relativity predicted the existence of gravitons and the existence of gravitational space-time technology, which is the core technology of the fourth-level civilization.

That being the case, the Yang-Mills canonical field, which is one of the fundamental structures of physics, is the basis for a complete theory of weak interactions.

In recent years, fundamental physicists have discovered that the strong interaction force may also be the effect of the Yang-Mills canonical field.

What does this mean? The weak force and the electromagnetic force have been unified, and if the action of the strong force is also the effect of the Yang-Mills canonical field, then the three forces are unified.

When applied theory keeps up and applied technology keeps up, the theory involved in the Yang-Mills canonical field may also be the core technology of a more powerful civilization. ”

"Unification of the four basic forces? No, unification is still a scientific prediction, or a goal of scientific research, and there is no data or systematic theory to prove that unification really exists......"

.......

Drip, drip, drip......

Lu Yi is lecturing, the people are living and working in peace and contentment, and the dark light 1098 intelligent warship that distorts time and space hidden near the earth is also passively accepting the situation on the earth and listening to the electromagnetic waves of human beings.

The reflection of sunlight on the ground, the information sent to the satellite by the ground communication base station, and the electromagnetic wave information sent by the communication base station in the dark light 1098 sector area will be obtained because of the point-to-surface diffusion characteristics of electromagnetic waves.

With the technology of a fourth-level civilization, it is not difficult to decipher the communication code of human beings, and it has been lurking for more than two months, and from the information obtained in these two months, Dark Light 1098 has finally determined the answer he wants.

[The scientific and technological development of this second-level civilization has experienced many abnormal outbreaks, and the development rate is 47.8 times that of the average civilization, and the civilization has inherited the genes and technology of a special producer intelligent civilization.

Based on the analysis of this information, the 96.74% probability of this second-level civilization is a special civilization, and the collection of civilization information is now carried out according to the predetermined procedure at No. 1098. 】

In the dark and cold space, a range of remote sensing electromagnetic waves suddenly appeared, and these remote sensing electromagnetic waves did not have the slightest trace of concealment, and scanned straight towards the earth......

"Dude."

After class, Lu Ying walked next to Lu Yi, and the little princess raised her head with a tangled expression and asked, "Are the high-level people like you usual?" ”

"Which one?"

Lu Yi asked with a smile, after class, his expression and tone were very gentle, and there was a little doting on his sister in his tone.

"That's it...... Very impersonal. Personal emotions and personal emotions have been thrown away by you, and even casualties are a string of data in your eyes. ”

Lu Ying's application was full of incomprehension, and she said confusedly: "Li Jiahao is a student of our city No. 1 middle school, and in the second year of high school, we went to the city No. 1 middle school to participate in the physics competition, he was one of our opponents, and I also saw his sister go to school to cheer him on, and their sister and brother have a good relationship." ”

"Xiaoying."

"Huh?"

"Let's change majors."

Lu Yi suddenly stopped, reached out and rubbed his sister's head, and said doting and seriously: "Didn't you want to study physics before, I'll go and tell her Mom, brother will help you change to a physics major."

After graduation, you want to study condensed matter physics, my brother will help you build a research center, you want to study high-energy physics or basic physics theory, Tomorrow Group has a plan to build a space ring orbital hadron collider in the near future, and if you want to study space gravitational waves, we also have our own gravitational wave observatory. ”

"Human beings are socially emotional creatures, and no one can treat casualties as a string of data, except for those who have completely lost their humanity.

Sometimes, though, you have to force yourself to think of it as a string of data.

The princess of our Lu family, just do what she likes happily and happily pursue and fulfill her dreams, there is no need to wronged herself. ”

Lu Ying looked stunned, thought for a while and shook her head at Lu Yi and said, "Brother, can I think about it and give you an answer?" ”

"Yes, then you can consider my opinion." Lu Yi looked at his sister's expression, sighed and said: "You are my own sister, I am your brother, and I should not be the object of your pursuit, you should have your own life and your own life." ”

"I see." Feeling Lu Yi's care and pampering, Lu Ying showed a happy smile on her face.

Drip, drip, drip!

You ere the shado to my life......

Suddenly, the watch in Lu Yi's hand sounded a rapid alarm and vibrate, and at the same time, the mobile phone in his pocket also rang.

"Zhang Qing, what's wrong?" Seeing the reaction of the watch in his hand, Lu Yi's face suddenly changed, and he hurriedly took out his mobile phone to connect the phone.

"Lu Lu, the Earth Monitoring System detected remote sensing electromagnetic waves from outer space again 2 minutes ago! Have you finished your class? The helicopter is coming to CUHK to pick you up! ”

Zhang Qing's anxious voice came from the earpiece, and the content of the words made Lu Yi's pupils shrink, and his heart rate also rose synchronously.

The thing that I had been worrying about for a long time appeared!

Taking a deep breath to calm his mind, Lu Yi calmly ordered: "Let the helicopter fly to the playground, and I will go to the playground now." In addition, let the monitoring department start the detector group in the far orbit to detect and analyze the attenuation data of the signal, and try to find the coordinate position of the signal source! ”

"Okay." Hearing Lu Yi's calm and calm voice, Zhang Qing's mood on the other side of the phone gradually calmed down.

"Yes, don't panic, go and notify the relevant personnel to prepare for the video conference.

The other party must only have one or two warships, and it is even very likely that it is an intelligent warship, otherwise it would be impossible to lurk for more than two months before moving. ”

Lu Yi took the phone and walked briskly towards the playground, and instructed: "Let the space department turn on the strong electromagnetic interference in the Earth's near-space orbit area, and the interference frequency band will change once every minute, urge the super large gravitational wave observatory to speed up the assembly and commissioning progress......"