Zhang Yuan quickly established a mathematical model: "Simply regard the Milky Way as a plane, that is, r^2. Consider one of the spacecraft doing standard Brownian motion, or two spacecraft doing independent standard Brownian motion.

"When the distance between two spacecraft is less than a small constant, such as 0.01, it is considered to be an encounter."

"Since the two-dimensional Brownian movement is often returned to neighbors, as long as the time is long enough, the two spacecraft will definitely meet."

"Consider two independent standard Brownian motions a(t), b(t).a(1)      b(1) and a(2) are the same distribution, because b(2)=b(1)    [b(2)-b(1)] is also the normal sum of two independent standard Brownian motions. This means that the distribution of the sum of the two independent standard Brownian motions at t time is equal to the distribution of a standard Brownian motion at 2t time."

Zhang Yuan frowned and said, "From this simple model, the probability of a moving spacecraft observing an alien civilization is twice as likely to be still. In other words, assuming that we can observe a civilization that can voyage between stars on average 1,300 years, it will take 2,600 years for the earth's civilization to observe it."

Lin Xuanxuan's little mouth opened slightly, which was simply some information produced out of nothing!

She felt a little proud again and sighed in her heart that she had a good vision.

Soon, Zhang Yuan shook his head. This was just a simple model. In addition, there were too few samples, so the real situation and the estimate must be very different.

"If interstellar civilization is not so rare, then this universe may be more exciting than we imagined!"

Of course, there are more than one smart person in the spacecraft. With just such a simple encounter, all kinds of ideas have emerged one after another.

The first question: How big is this alien spacecraft and where is it going?

According to astronomical observations, it is at least as big as Mercury! It is moving at 40% of the speed of light. The faint light spot is caused by the ultra-high speed moving hull, which collides with trace particles in the universe, and then the light is generated.

Because of the extremely high navigation speed, the observed images are like noodles, which are stretched a little.

Its movement direction is approximately 123 degrees with the movement direction of Earth Age. The destination is unknown. Anyway, it is definitely not the Earth, nor Glitze 581.

Seeing this, Zhang Yuan felt relieved. Anyway, it had nothing to do with their destination..

The second question is, have the alien spacecraft discovered the Earth Age?

It is very likely that there is no Earth Age. In the dim universe, you can't see your fingers. Without external electromagnetic radiation, it is difficult to find an object 0.12 light years away.

But the other party once sent a series of short signals, and I don’t know whether it was sent in a directional manner or in groups in all directions.

Zhang Yuan clicked on this series of signals, which were about 600 bytes, and many peaks and troughs were repeated, indicating that it was an electromagnetic signal with logical significance.

Unfortunately, because the amount of data is too small, it is impossible for people to decipher these alien words.

Then there was nothing. Even if the other party reported that he had good intentions, humans would not dare to observe boldly, and it was even more impossible to write a reply or scan it with radar. Besides, the radar of the Earth Age could not scan something 0.12 light years away.

Zhang Yuan felt a little regretful. There is never a lack of material in the universe, and the most precious thing is information. Human beings who have never communicated with interstellar civilizations have missed this time, and next time I don’t know if I will be the Year of the Monkey and Horse Month...

There are indeed many similar views in the post below.

[This civilization's technology is definitely much better than ours.]

[That is certainly not seen as a planetary spacecraft? Using nuclear fusion, there should be no way to accelerate this planet to 40% of the speed of light...]

[I think that the use of vacuum zero-point energy, or black hole energy, may also be an anti-gravity propulsion device, and we don’t seem to see the plasma flame at the injection.]

【It would be great if there was a little more observation data…】

After all, I have never felt the fear from the unknown. In these posts from recent times, people's thoughts are indeed more optimistic and open. Zhang Yuan felt a little itchy when he read various discussions, and he also wanted to express his own opinions.

"Look at it, confiscate it!" Lin Xuanxuan snatched his cell phone, "I'll be here today, and the patient must look like a patient. I don't care if you do whatever you want after you are discharged from the hospital."

A week later, Zhang Yuan was officially discharged from the hospital and started his normal work.

He is already a high-level manager. As the spacecraft ages, he no longer has a lot of time for his own as before.

His work became busier, and basically every week he organized manpower to maintain the entire spacecraft.

Moreover, in addition to the alien spacecraft he encountered by chance, Zhang Yuan also learned some other stories that have happened over the past few hundred years...

Nothing is good.

The first thing was that the old captain left the spaceship he loved in the third year after he hibernated.

The successor was Captain Lin of the Science Council.

Even if you have experienced this feeling many times, even if you are mentally prepared, it is still not so comfortable.

As soon as I opened my eyes and closed my eyes, some people disappeared...

The second thing is, unfortunately, since Mr. Aiding on Earth passed away, the spacecraft has completely lost contact with the earth.

No great men of the same era have appeared again.

What is going on on earth is a completely unknown.

Zhang Yuan sighed and devoted himself to his work...

...

A year passed quickly, and colleagues after colleagues were sent away, and then it was time to have a breakup meal and hibernate again.

The only one who can truly accompany him for a long time is Lin Xuanxuan, the life partner.

While having a meal, Zhang Yuan suddenly felt that it was really good to have someone who had been with him... Without this life partner, life might be worse.

"...How old are you this year?" Lin Xuanxuan asked.

"I? The old man over 1,300 years old, why?" Zhang Yuan just buried his head in his meal.

"Real age!"

"…30?" Zhang Yuan calculated carefully and suddenly realized that he was already thirty years old. And it happened that today was his birthday. In this environment, he really couldn't tell the passage of time, and he had never had the habit of celebrating his birthday.

"Happy birthday to the 30-year-old uncle!" Lin Xuanxuan took out a red apple and handed it to his hand.

"Thank you, this beautiful lady... and your body temperature!" Zhang Yuan joked. When he got used to playing and playing, he always felt an instinctive sense of casualness, just like a real relative.

(Why are there so many more books in the book review area and I say that I am so miserable? I have sent several messages per person? I can't say anything...)
Chapter completed!