After confirming that she was in contact with the news from 15 billion light years away, Lin Shanshan asked Professor Shen Wei to watch the video sent by Tianhua Xiaozhi.

"Good. Professor Shen Wei stared at the Proxima Centauri planetary system, "You are right, the first two planets have atmospheres, the first one is still very dense, it is not easy to accurately judge what kind of material it is made of, if it is inhabited - I am talking about the relocation of earthlings, maybe the second one is more suitable, the location is moderate, and the atmosphere is equivalent to that of the earth." The last three have no atmosphere and are not suitable for earthlings. Judging from what has been seen so far, its planets are getting bigger and bigger the farther outward, somewhat similar to the solar system, except that they are terrestrial planets, not gas planets. ”

"Why do we only focus on the speed of the spacecraft itself, and not consider the acceleration of the spacecraft when it flies in space...... Xu Jiawei was still immersed in the message sent from 15 billion light-years away, and didn't notice that the professor and Lin Shanshan were talking about Proxima Centauri, and talking to themselves about their own opinions.

"What did you say?" Lin Shanshan asked curiously.

Professor Shen Wei knew that Xu Jiawei had a new point of view coming out at this time, and he motioned to everyone not to speak and listen to Xu Jiawei.

"Design the route before departure, make clever use of the gravitational pull of the star, so that the original 100 times the speed of light will have a chance to accelerate when flying near a galaxy, and use the gravitational force of the black hole, of course, you have to master the technology, don't be attracted to it, this speed adds up to more amazing......"

"Professor, red dot, red dot, the message is coming, the message of prehistoric humans is coming. Lin Shanshan exclaimed excitedly, not bothering to interrupt Xu Jiawei's train of thought.

Professor Shen Wei asked Lin Shanshan to open the message and see if it was a follow-up to that message. Lin Shanshan unlocked the lock with her palm print, and an exciting Chinese character message appeared on the wall: "In the second report, we have reached a place of 15 billion light years, and in front of us is a transparent, very deep, vacuum-looking, invisible, intangible, and impassable wall, please indicate the next step." ”

This time, the message has the words "second report", which means that this news is connected to the earth, otherwise, if there are people who live on other planets and use Chinese characters, they will not fail to see this news, their technology is more advanced than ours. Professor Shen Wei became excited and said, "I decided to try to contact them immediately!"

"Why should we try to contact us when we are sure they are in contact?" Ms. Lin said.

"First of all, we don't know when the message was sent, and we can't say that we can receive the message 10 days before and after to confirm that it is an instant message, of course, we don't rule out the possibility of immediateness; secondly, whether our current language is still compatible with theirs also needs to be verified, and we can't say that if we can understand them, they will naturally understand us. Third, we need to build mutual trust, because it is a dialogue between human beings millions or even tens of millions of years apart, and the differences between the two are immeasurable, and the slightest carelessness can lead to disastrous consequences. ”

"Or the professor is thoughtful. Chen Jie refilled Professor Shen Wei and said.

"So what do we do next?" Mr. Ma said.

Shen Wei glanced at Xu Jiawei, who was still pondering, and said, "Classmate Jiawei, I want to hear your opinion. ”

"I wondered, can they provide us with a path?" Xu Jiawei was still following his train of thought.

"Well, you miss yours. Shen Wei decided not to disturb Xu Jiawei and let him think about what he was thinking, he motioned for Lin Shanshan, Ma Biao, and Chen Jie to leave the laboratory with him and continue to discuss the topic just now in the small conference room.

"We might as well name the other person the end of the sky, so that it is more convenient to have a name. The next step is to determine when the message will be sent to us at the end of the day, how quickly it will flow and whether they can read our language, the second step is to build mutual trust, and the third step is to determine their location, understand their environment, and their needs, and maintain regular contact. Professor Shen Wei said to everyone.

"There's a fourth step. Xu Jiawei walked in, and after seeing that the professor had finished, he continued, "Send the spaceship over to connect with them." ”

Professor Shen Wei was very interested in Xu Jiawei's topic and encouraged him to continue.

"Of course, this fourth step depends on the situation after the third step, and now you can make some preparations, such as the design of the spacecraft, which is a matter of time, even if it is not for this operation, it will be used in the future. As for the design of the path, it's always right to do some preliminary work first, even if you don't need it for the time being. Xu Jiawei said.

"Looks like you have your own ideas about the design of the ship and the design of the path. Very good, the follow-up work must be studied. But let's not talk about it now, the priority now is to come up with a proper language to make tentative contact with the end of the sky. Professor Shen Wei said, "Let's think about it, the general requirements are: simple, no ambiguity, no misunderstanding, and leave room for follow-up contact." The sooner the better, and it's best to send it today. ”

"Professor, it seems that you are as stable as Mount Tai, but in fact you are more anxious than us. Lin Shanshan said with a smile.

"Hehe, my emotions have been guessed by your little girl. Shen Wei said.

"In fact, our professor's first impression is that he wants to contact, but he is more cautious, and he must use the elimination method to eliminate all the reasons for not being able to contact before deciding to contact. Xu Jiawei said.

Professor Shen Wei said: "On the road of science, we cannot be without whims, but when it comes to a specific event related to human life, even a detail should be cautious. This is what our millennial thinkers said that we should despise the enemy strategically and attach importance to the enemy tactically. There's no one in the lab now, so think about it here, I'll be on duty in the lab. Everyone thought of a sentence according to what I had just asked, and then went to the lab to continue the discussion. ”

After Professor Shen Wei finished speaking, he walked out of the conference room.

"In my opinion, our professor has already thought about coming, but he didn't take a stand first and gave us a chance. Lin Shanshan said with a smile.

"I can see it too. Xu Jiawei said, "The professor is always so modest, if he thinks the same as him, he will not say his answer, and directly attribute the results to us, which has been the case for many years." ”

"I'm a technologist, and it's a bit difficult to come up with such a phrase at the request of the professor. Ma Biao smiled and said, "But I still have to think that I can't let down the professor." ”

"I ......" Chen Jie wanted to say but stopped.

"What does Chen Jie want to say?" Xu Jiawei said.

"Forget it, let's not talk about it, let's think about it seriously. Chen Jie said.

"Chen Jie has always been reserved. Lin Shanshan said.

After a while, the four disciples came to the laboratory.

"I figured it out so quickly. "Shen Wei is very happy," who said first. ”

"Me. Chen Jie said, "My opinion is: please tell me the direction." ”

"Tell me why. ”

This is the most clear sentence, simple and clear, there will be no ambiguity, no misunderstanding, and it also leaves an opening for the follow-up. Chen Jie replied.

"What if they knew exactly where they were going when they set off? With their skills, it was impossible for them to make a mistake in direction, wouldn't it arouse their suspicions if we asked such a question?" Professor Shen Wei obviously disagreed.

"I didn't think about it that much. Chen Jie took a sip of tea after speaking.

Ma Biao continued: "My opinion is: when will you be able to come back. It is also simple and clear, there will be no ambiguity, you can understand it at a glance, and it also leaves an opening for the follow-up. ”

"Ma Biao and Chen Jie's opinions are very good, we will use them in the future, but it is not very appropriate to use this sentence now, the tentative is in line, but the ambiguity has also arisen, will they understand that we let them come back?" Shen Wei said.

"yes, I didn't expect that. Ma Biao said.

Lin Shanshan said: "Professor, my opinion is, are you sure that it is 15 billion light years away?"

Professor Shen Wei thought for a moment and said, "We're sending Tianhua Ash to Proxima Centauri now, aren't we quite sure how many light-years away it has reached?"

Also, if prehistoric humans were still around, they would have known their location, which is not a very good question. Lin Shanshan said.

The lab fell silent, and everyone was lost in thought.

"Xu Jiawei, you haven't expressed your opinion yet. Professor Shen Wei said.

"I really can't think of a good opinion, so why don't I ask: What else is going on?" Mr. Xu said.

"I think it's okay. Lin Shanshan said.

Professor Shen Wei was silent for a moment and said, "The signal is interfering, and the received content is not clear enough, please send it again." ”

"Huh?" Xu Jiawei looked at the entire laboratory, and then at everyone, everyone also looked at each other, "Shanshan, is the signal interference?"

Lin Shanshan is an expert in deciphering codes, and ordinary signal interference does not work for her, but she can still recover the received content. She was also puzzled by the professor's words, "I didn't notice any signal abnormalities." ”

Ma Biao is in charge of technology, and he wants to overhaul the equipment when the signal is abnormal, but he can't see where the abnormality is, but the professor said that it is abnormal, and there must be a problem in that link, he said: "I'll check it." ”

The professor continued: "This not only solves the problem of not responding in time last time, but also tests the time of the exchange of messages, and also sees if the end of the day can understand what we mean, and the sentence itself will not be ambiguous." Let's look for fault with this sentence. ”

After a moment of silence, everyone suddenly became enlightened: "That's what you mean." ”

Everyone breathed a sigh of relief, understood what the professor meant, and felt that the professor's tentative idea was good and could achieve the expected goal.

"Professor, you've scared me, I'm going to overhaul the equipment. Ma Biao said.

Xu Jiawei and Lin Shanshan exchanged glances, and said in their hearts: I know that the professor has already had a bottom in his heart.

At this time, a message appeared on the wall, and something came in. Xu Jiawei said: "People's information has come, and we are still stupidly thinking about how to recover. ”

"How do you know it's from over there?" Lin Shanshan said.

"I judge. ”

Everyone's hearts are looking forward to it, expecting this message to be sent from the end of the day.

"I hope you're right. Lin Shanshan said and opened the message.