The development of civilization is traceable, and the corresponding scientific and technological means can also be roughly guessed.

In the prediction of Lu Yi and other scientists, the fourth-level civilization that has mastered gravitational technology and can sail with curvature can still use electromagnetic wave scanning if it wants to obtain detailed information about an object or a planet.

It's not that gravitational waves can't be detected, there is gravity when there is mass in matter, and gravitational waves can also be used as a means of detection from this perspective.

It's just that the gravitational pull of low-mass objects is so small that even if a civilization that has mastered curvature navigation, it is impossible to distinguish and detect a planet from gravitational waves.

Then if you want to detect and know the situation of the earth, you can only do it through electromagnetic wave remote sensing, so that humans can know through the detection probe.

This is a scientific and technological prediction of a fourth-level civilization that stops at mastering curvature navigation, and if it is a more advanced civilization, it will be beyond human imagination.

Of course, if it is really targeted by such a civilization, it is impossible for the current human race to have the ability to resist, and even if it is targeted by a fourth-level civilization, it will have no power to resist.

"What's going on now?"

Lu Yi took Professor Lin to the temporary control room, greeted the leaders who had already arrived first, and asked the engineers who were analyzing the electromagnetic wave data.

"The other party's remote sensing detection behavior continues, and this is the suspicious electromagnetic wave data detected by the Earth monitoring system."

The middle-aged engineer led by Lu Yi saw Lu Yi come in and exported a copy of the detected remote sensing electromagnetic wave data to Lu Yi to see.

"Professor Lu, you take a look here first, and I'll go and inform the Russian side." At this time, the leader who received a message explained to Lu Yi with a solemn face.

It has only been two years since human beings got rid of the shackles of the planet and walked to the starry sky, and the matter of the Qinglan people has just ended, and now there is an unknown civilization to launch remote sensing detection on human beings, which undoubtedly makes the high-level of human beings extremely vigilant and dignified.

"Okay."

Lu Yi nodded, and then carefully checked the suspicious remote sensing electromagnetic wave information obtained by the earth monitoring system.

"Recall the detection data of the 3 distance areas."

The Earth monitoring system covers the entire Earth and the surrounding space area, covering a diameter of 100,000 kilometers, a distance that even light can travel in a third of a second.

The propagation attenuation of remote sensing electromagnetic waves over such a long distance can reveal a lot of valuable information.

Remote sensing electromagnetic wave data was detected in three areas separated by more than 30,000 kilometers and displayed on the screen, and Lu Yi's eyes couldn't help but squint after a few seconds of seeing it.

Judging from the detection data of the three regions, this remote sensing electromagnetic wave has almost no attenuation after crossing 100,000 kilometers, which is not in line with the phenomenon of natural propagation of electromagnetic waves.

The only explanation is that the civilization that emitted this remotely sensed electromagnetic wave has a deep understanding of the study of electromagnetic forces, and has carried out technical transformation of the remotely sensed electromagnetic waves emitted.

The third-level civilization can only do it if it has studied electromagnetic force very deeply and mastered the energy shield, and even the blue civilization, which is already at the peak of the second-level, cannot do this.

"Turning on electromagnetic interference in outer space."

Lu Yi resolutely commanded electromagnetic interference, and then asked: "In addition, can this level of remote sensing detection detect our activities and invade our human network?" ”

"Professor Lu, the other party's remote sensing detection belongs to the medium and long wavelength band."

A middle-aged engineer who has studied electromagnetic remote sensing and electromagnetic radar technology for most of his life affirms: "This band can detect our activity on the ground, but the resolution is not high."

Human courts and other legal venues have also been transformed, and the roofs and walls are mixed with lead layers, so it is impossible for this alien civilization to detect and learn about our civilization system through remote sensing in the medium and long wavelength bands at such a long distance

As for network intrusion, the frequency of this band is not the same as our communication band, and it is impossible for wireless devices to identify and intrude into the network.

Unless it changes the frequency of the band to conform to our communication standards, but even then, our electromagnetic interference layer in outer space can avoid this. ”

"Keep up with electromagnetic interference and keep track of each other's situation."

Lu Yi nodded a little reassuringly, and then asked, "Can we find each other's location?" ”

The third-level civilization only has a relatively deep study of electromagnetic force and has developed the energy shield technology, and the engine navigation technology still cannot get rid of the working fluid principle, so the third-level civilization does not belong to the interstellar civilization that can travel long distances.

According to the predictions of human scientists, second-level civilizations colonize within the galaxy, and third-level civilizations colonize nearby systems at most.

If the territory of civilization expands further, it will be limited by the means of communication and navigation, and civilization will inevitably fall apart.

In this way, the civilization information harvesting ship of the third-level civilization will also be like the blue civilization, at most one or two.

Such a small fleet, even if the opponent is a third-level civilization, under the premise that it cannot sail faster than light and detect faster-than-light, as long as it finds the opponent's position and blocks the evasion route through the mass cannon calculation in advance, it can also kill the opponent.

As for faster-than-light detection, or faster-than-light communication, in the scientific and technological prediction of human beings, it is impossible to master it without mastering tachyon technology.

Quantum entanglement? This is a faster-than-light phenomenon, but this faster-than-light phenomenon cannot transmit information, so it does not have the basis for faster-than-light detection and faster-than-light communication.

As for mastering tachyons, that is, tachyons.

Let's not talk about whether tachyon exists or not, if it really exists, the scientific and technological level of human beings is already the middle level of the second-level civilization, and the research on finding tachyon has been carried out for a long time, and it can be determined that if tachyon really exists, it is not related to electromagnetic force, strong force, and weak force.

In this way, at least the fourth-level civilization could not master tachyon technology before, and even if the tachyon is not related to gravity, then the fourth-level civilization may not be able to use tachyon.

If the human beings who emit remotely sensed electromagnetic waves were a fourth-level civilization that had mastered curvature navigation, possessed faster-than-light navigation technology, and were constantly deploying large mass cannons in space, they would not be without the power of a single blow.

Because from the perspective of interests, even if it is really a fourth-level civilization, it is impossible to send a fleet to harvest the civilization information of human beings, which is an act that outweighs the losses.

So there is a high probability that it will be one or two, and it may even be an intelligent unmanned warship.

"I can't find it, but the attenuation phenomenon of this remote sensing electromagnetic wave is very weak, and it belongs to a very large range of coverage parallel emission, which makes the triangulation method also unworkable.

We can only determine the direction of the source of an area, and the distance can only be roughly determined to be in the Kuiper Belt area. ”

Lu Yi thought for a while, and said to the military personnel next to him: "Can you send an unmanned intelligent warship to search for the past along the direction of the source of remote sensing electromagnetic waves?" ”

"That's no problem, there are too few ones, let's send 3 directly."

A middle-aged man next to him, who had just participated in the memorial and silent ceremony, and wore gold stars on his shoulders, agreed with Lu Yi's decision and upgraded one battleship to three.

The layout of the space shading layer has been completed, and the establishment of the Human Federation has become inevitable, and there is no need for everyone to play military competitions anymore, so that the construction of tens of millions of tons of warships in the space dock is enough to draw out some resources.

The leader was discussing this matter with Russia, and after Lu Yi made some arrangements for the sudden remote sensing detection signal, he also took Professor Lin back to Yangcheng.

In front of the exploration of the traces of the Qinglan people and the follow-up Qinglan exchange plan, because it was a multinational alliance, the main control center was placed in Yangcheng, an international metropolis.

At this time, in the face of the sudden remote sensing detection of alien civilizations, it is most appropriate for Lu Yi to go back to Yangcheng, in terms of space equipment and space resources, Shangjing is not as good as Yangcheng.

Drip!

When Lu Yi and Lin Meng went back to the Yangcheng Laboratory, in the distant Kuiper Belt region, nearly 4.8 billion kilometers away from the earth, a flattened triangular battleship was flashing with subtle light, constantly receiving remote sensing electromagnetic waves fed back.

The length of the battleship is less than 20 meters, and the height is 3 meters, which is a small body, and it is almost certain that it is an unmanned intelligent warship.

[Darklight 1098 Search Ship Millennium Voyage Diary Report: In the millennium, 10982 visited 93,000 galaxies and discovered a total of 13 primitive civilizations, 7 first-level civilizations, and 3 second-level civilizations.

The number of civilizations is slightly higher than the average, and the birth of civilizations in the cantilever region of Orion is stable.

Among them, 12 primitive civilizations, 7 first-level civilizations, and 2 second-level civilizations are recognized as ordinary civilizations, and the relevant coordinates are recorded and will be prepared for regular return visits and tracking. 】

[In the 706th year of the voyage, one primitive civilization discovered was recognized as a special civilization.

The civilization was born in the depths of a giant gaseous planet and belongs to a special class of collective life.

In order to avoid being discovered by other civilization harvesters roaming the Orion cantilever area, the 10982 has collected civilization information from this civilization and left traces of the dark light civilization.

In the year 1000, 1098 was exploring an undocumented galaxy when it discovered a sudden anomalous fluctuation in the star activity of the galaxy, which was attributed to the activity of civilization.

1098 entered the galaxy, and through remote sensing, it was detected by remote sensing, a second-level civilization born in the third orbit of the galaxy, and it was initially deduced that the star anomaly was caused by an attack by high-energy light.

Through analysis, the fourth orbital planet of the galaxy once gave birth to civilization billions of years ago.

Through tracing the light wave detection, the scientific and technological development speed of this second-level civilization is abnormal, and it is preliminarily identified as a special civilization, and No. 10982 plans to further track ......]

After the intelligent system of 1098 transmitted the thousand-year-old voyage diary back to the interior of the dark light civilization through faster-than-light communication, the next moment the time and space around the battleship suddenly distorted, and the battleship entered a curvature navigation state and headed out of the solar system at nearly 400 times the speed of light.

In a very short period of time, half an hour later, the battleship was nearly 200 billion kilometers away from the Earth, and then the battleship began to turn around and enter the galaxy again in a small half circle around the solar system.

The more the battleship entered the interior of the galaxy, it seemed that it was to resist the influence of the stellar gravitational field, and it also seemed to be to precisely control the distortion of space-time to reduce the external gravitational waves, and the sailing speed of 1098 was gradually slowing down.

After crossing Jupiter's orbit, the speed of the 1098 battleship has dropped to 20,000 kilometers per second, and the speed continues to slow down.

......

Drip.

More than 4 hours after the 1098 sailed from the Kuiper Belt into the curvature, the Gravitational Wave Research Center of the Yangcheng Laboratory, a line of anomalously marked data was refreshed from the screen.

"Is it the curvature of an advanced civilization navigating gravitational waves again?"

Zhang Qing, who was analyzing the data, raised his head and glanced at this line of data, rubbed his forehead, and copied this line of data.

"The direction is 3.1° to the left of the Aquila Galaxy, and this direction has appeared more than 200 times in two years."

After roughly analyzing, and then opening the system of the radio telescope array to see if there were abnormal electromagnetic waves or ray fluctuations detected in this direction, after confirming that it was not detected, Zhang Qing knew that this was the gravitational wave data caused by curvature navigation, that is, the abnormal data discovered by Lu Yi before.

"Remotely sensed electromagnetic waves are gone? Okay, I see, don't let your guard down just yet, keep tracking. ”

The door of Lu Yi's research center nodded to the other researchers of the research center while talking on the phone.

Hanging up the phone from Shangjing, Lu Yi walked to Zhang Qing's side, leaned down and asked, "Did the gravitational wave detection find any abnormal phenomena in this day?" ”

Although he thought in his heart that the civilization that emitted remote sensing electromagnetic waves was a fourth-level civilization, out of insurance, Lu Yi still came over to determine whether the gravitational wave detection had found any abnormalities.

If it is a fourth-level civilization, they will definitely not use it if they have mastered the curvature navigation, and once the curvature is sailing, the space-time distortion may leave traces of gravitational waves.

Yes, it is possible, because of the lack of understanding of curvature navigation, Lu Yi cannot determine whether the warship will only produce gravitational waves when it enters and exits in the curvature navigation state, or whether it will continue to produce gravitational waves.

"Yes, just before you came in, two gravitational-wave observatories in space detected an anomalous gravitational wave in the direction of the Aquila galaxy that was traveling in curvature."

Zhang Qing heard Lu Yi's inquiry, and casually exported the abnormal gravitational wave data detected by the gravitational wave observatory just now.

"Before I just came in? Aquila direction? ”

Lu Yi looked at the gravitational wave data, his brows suddenly furrowed, and he took out his mobile phone and called back the call just now.

"What is the exact time when the remote sensing detection signal disappears?"

"16:53:08? Okay, I got it. ”

Lu Yi looked at Zhang Qing's time when the gravitational wave observatory detected abnormal gravitational waves, and hung up the phone with a dignified expression.

"Lu Lu, what's wrong?" Seeing that Lu Yi's expression was a little wrong, Zhang Qing hurriedly asked.

"I'll make sure."

Lu Yi shook his head, reached out and took the paper and pen next to him, and quickly drew the coordinate position of the current gravitational wave observatory with the pen, drew a straight line along the direction of the Aquila Galaxy, and drew a straight line in the direction of the source of the remote sensing electromagnetic waves detected by the Earth monitoring system before.

The two lines intersected at a distance, and Lu Yi connected the coordinates of the gravitational wave observatory and the earth monitoring system in a straight line, finally forming a triangle.

Knowing the angle of this triangle, the distance from the gravitational wave observatory to the earth monitoring system, through the trigonometric function, Lu Yi quickly calculated the distance from the intersection point to the earth.

It is about 4.8 billion kilometers from the Earth! Kuiper Belt Area!

Looking at this calculated distance value, even though he had prepared in his heart before calculating the trigonometric function, Lu Yi's expression was still stunned.

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