Wandering Spaceship in Deep Space Chapter 155: Frequency of Interstellar Civilization Activities

Zhang Yuan quickly established a mathematical model: "Think of the Milky Way simply as a plane, which is R^2. Consider one of the spacecraft doing standard Brownian motion, or two spacecraft doing independent standard Brownian motion. Sports.

"When the distance between two spacecrafts is less than a small constant, such as 0.01, they are deemed to have met."

"Since the two-dimensional Brownian motion recurs in the neighborhood, 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 distributed the same, because B(2)=B(1)+ [B(2)-B(1)] is also the sum of two independent standard normals. This means that the distribution of the sum of two independent standard Brownian motions at time t is equal to the distribution of a standard Brownian motion at time 2t. "

Zhang Yuan frowned and said: "Considering from this simple model, the probability of observing an alien civilization from a moving spacecraft is twice that of a stationary one. In other words, suppose we can observe once in an average of 1300 years. A civilization capable of interstellar voyages, the earth civilization needs 2600 years to be observed once."

Lin Xuanxuan opened her mouth slightly, this is simply some information generated out of nothing!

She was a little proud again, and she secretly sighed that she had a good vision.

Soon, Zhang Yuan shook his head. This is just a simple model. In addition to the fact that there are too few samples, there must be a big difference between the actual situation and the estimate.

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

Of course, Zhang Yuan is not the only wise man in the spacecraft. With such a simple encounter, various ideas have emerged in endlessly.

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! And it is moving at 40% of the speed of light. The faint light spot is caused by the friction and collision of the ultra-high-speed ship hull with the tiny particles in the universe, and then the light is produced.

Because of the extremely high sailing speed, the observed image is like noodles, stretched a bit.

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 is it Gliese 581.

Seeing this, Zhang Yuan relaxed a little, because it had nothing to do with their destination anyway. .

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

Probably not. The Earth Age is still too small. In the bleak universe, you can’t see your fingers. If there is no external electromagnetic radiation, it is difficult to find an object 0.12 light-years away.

But the other party has sent a series of short signals, and I don't know whether it was sent directionally or sent in groups in all directions.

Zhang Yuan clicked on this series of signals. There are probably more than 600 bytes. There are also many peaks and valleys that are repeated, indicating that it is an electromagnetic signal with a logical meaning.

It's a pity, because the amount of data is too small, it is impossible for people to decipher these alien texts.

Then there is no more. Even if the other party reported good intentions, humans would not dare to boldly observe, let alone write a reply, or scan it with radar. Besides, it is impossible for the Earth Age radar to scan things 0.12 light-years away.

Zhang Yuan feels a bit regretful that there is never a lack of matter in the universe, and the most precious thing is information. Human beings who have never communicated with interstellar civilization have missed this time. I don’t know the year of the monkey next time...

Sure enough, there are many similar points in the post below.

[This civilization's technology is definitely much stronger than ours. 】

[Surely, did you see a planetary-level spacecraft? There should be no way to use nuclear fusion to accelerate this kind of planet to 40% of the speed of light......]

[I think it uses vacuum zero point energy, or black hole energy. It may also be an anti-gravity propulsion device. We don't seem to see the plasma flame at the jet. 】

[It would be great if there were more observation data...]

After all, I have never felt the fear that comes from the unknown. In these recent posts, people’s thoughts are really more optimistic and open. Zhang Yuan's heart is a little itchy after all kinds of discussions. He also wants to express some of his own opinions. .

"Be optimistic, confiscated!" Lin Xuanxuan snatched his mobile phone, "I'm here today, and the patient must look like a patient. I don't care what you want after you leave the hospital."

One week later, Zhang Yuan was formally discharged from the hospital and started normal work.

He is already a high-level manager. With the aging of the spacecraft, he no longer has a lot of his own time like before.

His work has become more busy, basically every week, he will organize a manpower to maintain the entire spacecraft.

Furthermore, apart from the alien spacecraft that he met by chance, Zhang Yuan also learned some other stories that have happened in the past few hundred years...

None is a good thing.

The first thing, the old captain left the spaceship he loved in the third year after his hibernation.

The successor is Captain Lin of the Science Council.

Even if this feeling has been experienced many times, even if you are mentally prepared, it is still not so comfortable~ IndoMTL.com~ Once you open your eyes, when you close your eyes, some people have disappeared...

The second thing, unfortunately, since the death of Mr. Edin on the earth, the spacecraft has completely lost contact with the earth.

There will never be a great man of the same era.

What is going on with earth civilization is already a complete unknown.

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

……

One year passed quickly, sending away one colleague after another, and then it was time to eat casual meals and hibernating again.

The only person who can accompany him for a long time is Lin Xuanxuan, his life partner.

During the meal, Zhang Yuan suddenly felt that it is really nice to have someone who has been with him... Without this life partner, life might be worse.

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

"Me? Uncle over 1,300 years old, why?" Zhang Yuan just buried his head in the meal.

"True age!"

"...30?" Zhang Yuan carefully calculated it, and suddenly realized that he was already thirty years old. And it just so happens that today is the birthday. In this environment, he really couldn't distinguish the passage of time, and he never had the habit of birthday.

"30-year-old uncle, happy birthday!" Lin Xuanxuan took out a red apple and handed it to him.

"Thank you, this beautiful lady...and your body temperature!" Zhang Yuan joked. Getting used to playing around will always give birth to an instinctive sense of randomness, just like a real relative.

(Why there are so many people in the book review area who say that I am watery, how many of them are posted by one person? There is nothing to say...)

(What else is required to be fast-paced and relaxed? This is not a Xiaobai in the first place, my reading object has never been Xiaobai, OK?)