Fourth-level civilization! There is no doubt that it is a fourth-level civilization that launches remote sensing scanning of humans.

So did he leave, or did he enter the solar system, or even already lurk on Earth?

The third-level civilization Lu Yi is not worthy, because this is the base camp of human beings, as long as it is not for the attention of the entire fleet of the third-level civilization that is fighting the attention of human beings, Lu Yi is sure to bury them all in the solar system.

But the fourth-level civilization, the fourth-level civilization that has mastered the curvature navigation, has exceeded the limits of human science and technology.

Mankind's understanding of the fourth-level civilization is nothing except for the curvature navigation and the material disintegration bomb revealed by the blue people, and the rest of the technology is not even known, and even the slightly more detailed information about the curvature navigation and the material disintegration bomb is not known.

War is about information, and I don't even know the situation of the fourth-level civilization and the technology we have mastered, so how can we do this?

"Zhang Qing, if there is a fourth-level civilization warship deliberately hidden, what way do we find it?"

Lu Yi was silent for a while, and suddenly asked Zhang Qing.

He didn't ask about the LO system, because he knew that he had crossed two levels of civilization, and asking questions involving gravitational space-time technology, even if it was just a question and not specific data, would require an astronomical amount of credit.

"Lu Lu, what's wrong?"

Zhang Qing has been staying in the research center for several hours and has not gone out, and she still does not know that the earth monitoring system has detected suspicious remote sensing electromagnetic waves.

"The Earth monitoring system detected a suspicious remotely sensed electromagnetic wave more than four hours ago, and now it is determined that the alien civilization that emitted this remotely sensed electromagnetic wave belongs to the same side as the curvature navigation gravitational wave detected by the gravitational wave observatory just now."

Lu Yi briefly told Zhang Qing about the process of the incident and his own analysis process.

The current gravitational technology of human beings cannot simply calculate the distance value of the source of gravitational waves through gravitational waves, and can only obtain a direction value by detecting gravitational waves.

The reason why the black hole fusion of gravitational waves was discovered a few years ago is determined to be a black hole fusion and the distance is determined is because in addition to gravitational waves, the collision of the accretion disk before the black hole fusion has erupted into a strong radiation that sweeps across the universe, so that the upcoming black hole fusion has been discovered by mankind in advance.

"The warships of the fourth-level civilization should be hidden, not to mention the conventional camouflage and concealment methods, whether they can be discovered by the outside world in the most critical curvature state, which mainly depends on the size of the warship and the degree of development of gravitational space-time technology.

So I don't know how to find the hidden Tier 4 Civilization Battleship, which is beyond our technical scope. ”

After listening to Lu Yi tell what happened, Zhang Qing also understood the seriousness of the matter.

It's just this question, even if the two largest space gravitational wave observatories in charge of human civilization, after more than a year of research and precipitation, her research on gravitational space-time says that human beings are second and no one dares to call them first, then it can't give an accurate answer.

Lu Yi also showed a wry smile on his face, physics is his main subject, and his insights in the field of gravitational waves are not low.

Zhang Qing's meaning is very clear, the large the battleship, the curvature of the navigation needs to distort the range of time and space, and the corresponding gravitational wave traces are also relatively strong.

The smaller the battleship, the smaller the distorted space-time range, and the slight trace of gravitational waves.

The corresponding gravitational space-time technology is more developed, so the control of gravitational space-time can be more subtle, and vice versa.

Once the warship of this fourth-level civilization is small enough, or the gravitational space-time technology is developed enough, the gravitational fluctuations caused by distorting space-time are beyond the detection limit of humans, so that even if the opponent is near the earth's orbit, it will be impossible to detect it.

Distortion of space-time will also cause distortion of light propagation, which is not a problem for civilizations that can accurately control the curvature of gravitational space-time and space-time, and it is no problem to bend space-time and time around and then splice it back.

"You can keep the gravitational wave detection here, you can consider moving the gravitational wave observatory in space to check around the earth, since the other party has turned off the remote sensing electromagnetic waves, then if you want to determine the situation of human beings, the location that you really want to hide must not be far from the earth.

I'll talk about this matter to the leader first, and first investigate the camouflage and concealment of conventional means.

I hope that the other party did not take a fancy to us and left. ”

Lu Yi explained a few words to Zhang Qing, hugged lightly, and then turned around and walked outside.

Although he hoped in his heart that this fourth-level civilization did not take a fancy to the human civilization information, and left directly after scanning it for a while, Lu Yi still did not dare to take it lightly.

When it comes to the safety of the entire civilization, everything needs to be done with caution.

......

"Professor Lu, is what you said true?"

The video conference of the heads of state, which had just ended, started again at the request of Lu Yi.

After listening to Lu Yi's story, the leaders of their brows suddenly furrowed, and the head of the United States subconsciously asked.

Even if they are not scientists, they also understand that the fourth-level civilization that has mastered the gravitational space-time technology is not something that the current human race can resist, even if there are only one or two warships, the human race can destroy it through the covering attack of the mass bomb, but the counterattack of the fourth-level civilization only needs one moment, and the human race may be extinct.

"The gravitational wave data detected by the gravitational wave observatory has been sent to all the scientists who study gravitational waves.

Through trigonometric calculations, the direction of the detected gravitational wave and the direction of the remotely sensed electromagnetic wave detected by us intersect at a distance of 4.8 billion kilometers from the Earth.

This coordinate location is exactly in the Kuiper Belt region, which is the source area where we analyze the electromagnetic waves of remote sensing.

4.8 billion kilometers is exactly equal to more than 4 optical hours, and electromagnetic waves propagate at the speed of light, which is also consistent with the fact that we detect remote sensing electromagnetic waves and disappear for more than 4 hours.

One data match, this may be a coincidence, but two, or even three data match, then it can't be a coincidence. ”

"Professor Lu, what do you think we need to do now?" The Russian Führer was silent for a few seconds and asked.

Just as Lu Yi did not dare to take it lightly when it came to the safety of the entire civilization, senior human managers like the leader did not dare to relax in the slightest.

Perhaps this mysterious fourth-level civilization does not look down on the fact that human civilization information has left the solar system, but it is also possible that it has entered the solar system and is ready to collect and harvest human civilization information.

When it comes to the survival of civilization, even if there is a 1 in 100 million probability, it must be ruled out.

"The other side's remote sensing electromagnetic waves have disappeared, and if the active electromagnetic wave scanning is activated again, it will definitely not be able to hide from our earth monitoring system.

Since the electromagnetic signal has disappeared, if the other party wants to observe and obtain our situation, it must be near the earth, and it must be observed on the sunny side of the earth, with the help of the reflection of sunlight. ”

Lu Yi briefly explained the logical reasoning of this matter, and then continued: "So what we need to do now is to search the area of the Earth facing the solar hemisphere, and make sure that the other party is not hiding on our spacecraft in camouflage, and there is no camouflage hidden in the space visor.

This is a conventional camouflage and concealment means, and then we need to arrange a large number of ray probes in the earth's low-altitude orbit to distinguish the sunlight as much as possible to determine whether there is abnormal deflection or distortion of the rays, which can roughly rule out the hiding and optical invisibility in the curvature state.

If we have the ability, we can arrange a semi-permeable film on the sunny side of the earth, allowing sunlight to shine on the earth and block the reflected light from the earth.

In this way, unless the other party launches an active detection, it can avoid the leakage of our information, but this construction period is too long, and it is not recommended for the time being. ”

The leader tapped his fingers on the table, pondered for a moment and asked, "Is this enough to prevent the leakage of our information?" ”

"If the other party does not turn on active scanning detection, it can be eliminated, if active detection is turned on, the other party has a deep study of electromagnetic force, and a layer of semi-permeable film alone cannot be stopped."

Lu Yi added that everyone did not consider that this fourth-level civilization had left, but completely assumed that the other party had already targeted the human race for deduction and prevention.

"If the other party starts active scanning and detection, can we locate and find the coordinates of the other party, and then destroy the other party with a mass cannon?" The Russian head of state asked Lu Yi questions.

"I'm sorry, but there's a high probability that I can't locate it."

Lu Yi smiled bitterly, shook his head and said: "The other party's research on electromagnetic force far surpasses ours, and they can already transform the emitted electromagnetic waves through scientific and technological means, so that the possibility of accurately locating the source with our technology is very small." ”

Under the age of technology, some problems are so desperate, even if the other party scans and probes under your nose, you may not be able to find the other party.

"We should have some other way to know for sure, right?"

Everyone was silent, and in the end, the leader knew Lu Yi's character better, and knew that if there was no way, he would not ask for this video conference.

"There's a way, and that's gravitational waves."

Lu Yi nodded and explained: "They can transform the manifestation of electromagnetic waves so that we can't locate them, but gravitational waves definitely can't be transformed.

If they have the technology to transform the representation of gravitational waves, it will not be possible for us to detect it, and we will simply resign ourselves to fate and have no need to struggle.

In response to this method, I apply to the leaders to build a new super-large space gravitational-wave observatory, the current gravitational-wave observatory is too small, the accuracy is not high enough, and some subtle gravitational fluctuations cannot be detected. ”

A super-large space gravitational-wave observatory?

The leaders were stunned for a moment and asked, "How big does it be?" ”

"The arm is 1,000 kilometers long, and we need three, so we can form a triangulation to determine the source coordinates of the gravitational waves."

After civilization got rid of the shackles of the planet and walked to the starry sky, several leaders who had made up for a lot of scientific common sense during this time couldn't help but tremble when they heard Lu Yi's request.

At this time, they also understood why Lu Yi wanted to apply for civilization resources for construction, instead of building it at his own expense like before, it was really too difficult for this project.

The arm length of the gravitational wave observatory on the earth is no more than 4 kilometers, and the arm length of the two gravitational wave observatories built by Lu Yi himself in space is only 50 kilometers.

Now it has been raised to 1,000 kilometers all at once, even if it is the current level of human productivity and science and technology, it is a big project, and it is even more difficult than the project of the space shading layer.

The engineering difficulty of the space shading layer is the quantity, and the engineering difficulty of this 1000-kilometer gravitational-wave observatory is the technology.

It's not that the technology isn't up to standard, it's that the technical precision involved is cumbersome.

The principle of the gravitational wave observatory of the laser interferometer is carried out through the principle of the shortest distance propagation of light along time and space, and the gravitational waves also fluctuate in time and space, which will cause the propagation fluctuations of the laser, which will be manifested on the polarizer.

This means that the gravitational-wave observatory's laser arm should be absolutely straight.

A 4 km straight vacuum tube was fine, a 50 km straight tube was a bit difficult, but it was eventually built.

Now for 1,000 kilometers, it will take the strength of the entire human civilization and a large number of engineers and advanced equipment to talk about construction.

"Leaders, two heads of state, the construction of these 3 gravitational-wave observatories, in addition to dealing with this possible invasion of a fourth-level civilization, will also be a barrier for our human race afterwards.

With these three gravitational-wave observatories, we will be able to ensure that any Tier 4 civilization warship can be detected close to the solar system, and it will also be a powerful tool for studying gravitational waves.

Our civilization has gone to the starry sky, and in this dark interstellar, scientific and technological strength is the greatest guarantee of civilization.

The third-level civilization is not safe, only the fourth-level civilization that can travel faster than the speed of light can be considered stable and worry-free in this dark interstellar world.

Curvature faster-than-light navigation is a branch of gravitational space-time technology, and we must increase investment in the research of gravitational waves, so as to preserve the stability of civilization in future crises. ”

"Yes, Huaguo agrees to this application." After thinking for a while, the leader finally agreed to Lu Yi's application request.

In order to ensure that society is not overwhelmed by the huge productive forces, the vast majority of the productive forces are invested in the bottomless pit of scientific research needs.

Now that the fourth-level civilization may invade, it is not unreasonable to turn productivity to solve and investigate this invasion incident.

In addition, what Lu Yi said is also reasonable, the super-large gravitational wave observatory is not only a barrier to detect the invasion of fourth-level civilizations, but also a supreme weapon for studying gravitational waves.

"The United States also agrees." The head of the United States pondered for a while, and also agreed to Lu Yi's application.

"It's okay on the Russian side."

The Russian Führer followed suit and said: "However, we need to set aside a resource for the construction of a large mass artillery battery in space, whether this fourth-level civilization really invades or not, in the end, we must rely on force to ensure our interests and the safety of civilization."

Now the number of mass artillery batteries in space is not enough, we must increase the amount of construction to ensure that a single collective launch of mass cannons can block all the opponent's dodge space and destroy the opponent with a hit. ”

The establishment of the Human Federation has been inevitable, and the internal strife of various countries has almost stopped, and now everyone is focusing more on the overall development of civilization and ensuring the safety of civilization.

Huaguo, Russia, and Mi all agreed, which was almost equivalent to gathering the resources of the entire civilization, Lu Yi put a stone in his heart, and then said: "I have one final proposal." ”

"What proposal?"

"We need to prepare a seed plan for human beings to send to outer space."

Lu Yi's expression became serious, and he said seriously: "The seed plan can be modeled on the inheritance of the Muba civilization and use the intelligent system to continue.

The plan is divided into two, one is the inheritance that contains information about our human history and civilization, which prepares for the normal demise of humanity.

The other is to retain only the simple genetic embryo and scientific and technological information, and do not involve the inheritance of civilization and culture, so as to avoid the complete extinction of human beings by harvesting civilization information......"