After talking about an encounter between the Soviet Air Force and UFOs in the 60s, he suddenly asked: "Who of you has ever seen UFOs with your own eyes?"

Some people said that when they were children, they had seen a shining plate flying over at night in the countryside; some people said that they saw a group of bright spots flying in the sky at night, and the speed was very fast, flashing and flashing; and another student said that they saw a bright thing flying up on the edge of the forest, and it flew up swayingly and leisurely, and it flew so high all the time, this should not be a flying saucer taking off, right?

As a result, this classmate was despised by everyone, and everyone laughed: You pampered person, you haven't even seen Kong Ming Lantern in the countryside, right?

Everyone was talking lively, and suddenly a male classmate asked: "Teacher Situ, they all say that UFOs are alien flying objects, so are there really aliens in the world?"

The noise subsided a little, and the students stopped talking to see how the teacher on the podium answered the question.

Situ Xiao nodded, and said loudly: "This question raised by this classmate is not only your question, but also the question of all scientists and enthusiasts in the world, the whole world is exploring this answer, but unfortunately, on this issue, the academic community has not yet reached a conclusion."

So far, there is no evidence of direct formal contact between human beings on earth and extraterrestrial intelligent life, but it is not uncommon to report various cases of extraterrestrial intelligent beings visiting the earth and coming into contact with humans, and there have been more than 10,000 cases of this regard at home and abroad.

Of course, most of these tens of thousands of reports have been proven to be false, but excluding these false examples, there are also a few cases with high credibility, which not only have very detailed evidence and witnesses, but also some have even been confirmed by government or military observation records, and the credibility is very high.

From the point of view of logical judgment, in all these examples, even if it is falsified by 99%, there is no problem, as long as one example cannot be falsified, it is enough to prove the existence of extraterrestrial intelligent beings. In my personal opinion, the existence of extraterrestrial intelligent beings is unmistakable.

In addition, there is strong evidence for the existence of extraterrestrial life. It has now been proved that there are more than 120 billion stars in the Milky Way alone, of which about 10 percent are sun-like stars; so far, in the range of 50 light-years alone, hundreds of stars very similar to the sun, such as Canis canis β, A-, and Tianzun, have been discovered -- and galaxies like the Milky Way are estimated to be only one medium galaxy in the universe, and the number of extragalactic galaxies discovered has exceeded 100 billion.

It can be seen that the number of galaxies similar to the solar system is very large in the universe, and the number is enough to be counted in billions. I think it is very illogical to say that life and intelligent life are born only within our solar system - I personally believe that life in the universe should be very common, and that intelligent life on extraterrestrial planets must exist.

Of course, this student's question was 'do aliens exist in zài', and I answered 'do alien intelligent beings definitely exist in zài', and there is still a certain gap between the two. My opinion is: extraterrestrial intelligent life is certain and inevitable!"

Teacher Situ Xiao talked about the Tao above, but Xu Yan muttered directly below: When chatting last night, Zhu Youxiang said that she was from another world, and Xu Yan really believed it. But now, after a night, he suddenly became a little suspicious again-just like believing that Zhu Youxiang was a paranoid, believing that Zhu Youxiang was from another world or an alien world, there were also many flaws that were difficult to justify.

If Zhu Youxiang is a creature from another planet, then why is she so similar to humans, almost identical?

After hesitating, Xu Yan raised his hand, and Teacher Situ Xiao saw him, nodded and said, "This male classmate in the back row, please speak." ”

Xu Yan stood up: "Teacher Situ, hello." I am very inspired and benefited from your class, but there is one thing I would like to ask the teacher for your opinion. ”

"Please tell me about this classmate. ”

"Excuse me, teacher, according to what you said, how can you tell if a person is an alien?"

Situ Xiao frowned slightly, and he said confusedly: "This classmate, what do you mean? I don't understand very well. ”

"Teacher, let's put it this way, if I just met a new friend and I don't know much about him, but this friend says that he is an alien who came to Earth from an alien, then how can I tell if he is telling the truth or not?"

Many students in the class laughed, probably thinking that Xu Yan's question was too naïve. Teacher Situ Xiao was also smiling, but he didn't laugh at Xu Yan, but said very seriously: "This setting question raised by this classmate is really a bit novel, I really haven't thought about it before." ”

He groaned slightly, and asked Xu Yan rhetorically: "This classmate, let's follow the usual analysis steps and judge step by step: Is there any difference between the friend you call yourself an alien and a normal person in terms of appearance and physical characteristics?"

"He looked like a normal man, and he wasn't ugly - well, not ugly, but beautiful. ”

"Oh, that means that in terms of physical appearance, this friend of yours is no different from a normal person. So, what language do you use to communicate with him?"

"Chinese, of course we speak Chinese. ”

"Do you speak Chinese? Did your friend speak Chinese after he came to Earth?"

"Well, it's not, according to him, it's like the Chinese language is used on their planet - oh, their planet is very similar to our history, their country is called the Ming Dynasty, they have an emperor, they have a court, they have a brocade Weidongchang or something...... It's very similar to our history, anyway. ”

There was a slight burst of laughter in the hall again, and this time, Teacher Situ also smiled, and he pressed his hand: "Okay, this classmate, you can sit down, we can basically get the answer to your question."

First of all, if you say that your friend's physiognomy is no different from that of a human being, and that he is also a 'humanoid intelligent being', then we can be sure that your friend must be from a world that is similar to or even identical to the earth's environment.

Because, on different planets, there are completely different natural environments. Some planets are completely water, some planets are completely deserts, some planets give birth to carbon-based organisms, and some planets give birth to silicon-based organisms -- intelligent creatures that have evolved in completely different natural environments are not identical in composition, constitution, and appearance, and even the probability of similarity is very small.

The intelligent races that have evolved on various planets can even reach the "gate" or "boundary" level in biology, and may even be different at the atomic level, the idea that "aliens look similar to earthlings" is completely the naïve idea of the frog at the bottom of the well,

Therefore, the probability of intelligent beings born on two different planets is very, very small. Small differences in the composition of the air, differences in temperature, differences in the range of sunlight can have a considerable impact on people's physical appearance, and even the same intelligent species, at different stages of evolution, the difference is also very huge - for example, we humans and gorillas are both primate species, and both evolved in the same earthly environment, but who can see that gorillas are not only the same species as us humans, but even our human ancestors?

Secondly, if you say that your friend also speaks Chinese, then it is even more impossible to explain - if we are all human beings, this can be explained by the extremely small probability that "the environment of the two planets is similar, so the biological evolution process is also the same", then your friend is speaking Chinese, then there is no way to explain it by coincidence.

You must know that different civilizations and histories will also form different styles of writing and language. The uniqueness of the Chinese language is composed of the unique geography, humanity and events of our Chinese nation, which cannot be replicated.

If two different planets form the same language and script, this cultural similarity is more incredible than the biological similarity, and even miracles are impossible to explain.

This classmate, let me put it this way, the probability that your friend is an alien is smaller than the probability of winning the jackpot if you go to the lottery station at the school gate and buy a random lottery ticket, and you also have a smaller probability of winning the jackpot for the previous year in a row.

According to your description, your friend also thinks that he is from an alien country in the Ming Dynasty, and if he is joking with you, then it is fine, if he really thinks so, I think...... Your friend should insist on taking the medicine, and the effect will be effective. ”

There was another burst of laughter from the students in the hall, Xu Yan was also a little embarrassed, he sat in the seat, his face was a little hot, and the girl sitting next to him glanced at him, with some curiosity in her eyes.

She leaned over and asked in a low voice, "Do you really have such a friend?

Xu Yan smiled awkwardly - he was so ugly for no reason, but he attracted the attention of beautiful girls, which was also a blessing in disguise. He whispered, "I've known her for a short time, and I don't know, she does have a bit of a chatter." ”

"Hehe, that's funny, is that person also a student of our school?"

"No, I met that guy outside. Xu Yan was inspired and asked, "By the way, classmate, I am from the Department of Economics and Management, my name is Xu Yan, and I am a sophomore this year." I think I've seen you somewhere, you know you very well, what's your name, can you know you?"

The lesbian table glanced at Xu Yan, and her eyes were a little helpless - such an old-fashioned way of accosting her, it seems that she has dealt with countless times. She bowed her head slightly, took Xu Yan's notebook and wrote the words "Gong Xueting", and she whispered: "I am in the second class of the Department of International Trade, and I am also a sophomore. ”

Xu Yan suddenly became excited: "Oh, you are also from our School of Finance and Economics?"

The Department of International Trade and the Department of Economics and Management both belong to the School of Finance and Economics of Shudu University, and many public courses of the two departments overlap, and they are often taught together. After knowing Gong Xueting's major, Xu Yan was immediately excited: Doesn't this mean that there will be many opportunities to take classes with beauties in the future?

Gong Xueting let out a soft "um".