With curvature, as long as its speed exceeds the speed of light, it cannot be seen from any wavelength of light or radiation. With Xiao Yu's current level of science and technology, there is only one way to find out the objects that are sailing at the speed of light, and that is the tachyon detection instrument. As for whether the higher civilizations have other methods, Xiao Yu is not clear.

"Things here are coming to an end, it's time for me to continue on a new journey, to find low-level civilizations, let them come under my command, develop technology, and improve ......my strength," Xiao Yu thought.

Xiao Yu's course was in the direction of Yinxin. Because the closer you get to the galactic center, the denser the stars become, and the easier it is to encounter the rest of the intelligent civilizations.

Of course, there are some limitations to this density, and bigger is not always better. For example, in the galactic center, the density of stars can even reach the level of one every few hundred million kilometers, and it can be easily deduced that such a place is not suitable for intelligent life.

Moreover, the stars at the galactic center are mainly old stars, various white dwarfs, neutron stars, black holes and other extreme stars. There are not too many juvenile and juvenile stars there. Xiao Yu speculated that this phenomenon may be related to the supermassive black hole at the center of the galaxy. Just as objects with higher densities will sink and objects with lower densities will rise, high-density objects such as white dwarfs, neutron stars, and black holes will also be deposited into the galactic center, and normal stars will tend to move away from here.

The environment of the galactic center is very extreme, the black hole devours the rest of the stars, and the collision of various stars and other violent phenomena are very common. If there are intelligent beings living and evolving in such a place, it will be unexpected.

In Xiao Yu's inference, the fifth-level civilization can already be regarded as a relatively advanced existence in the galaxy, and the development degree of civilization will also show a pyramid shape, that is, the more advanced the civilization, the rarer the number. In terms of probability theory, there is a fifth-level civilization. It inevitably means the existence of more low-level civilizations. Therefore, it can be concluded that if you really encounter a smart civilization, then the probability that it is a level 4 or less civilization will inevitably be greater than the probability that it is a level 5 or 6 civilization.

That's right, Xiao Yu is actively looking for wisdom and civilization. With the development of science and technology to the point where it has now, Xiao Yu has fully realized the importance of communication. It's not okay to work behind closed doors and rest on your laurels. Xiao Yu is actively making changes, whether it is trying to expand the number of civilizations under his command, or taking the initiative to find other civilizations to communicate, it is based on this.

A complete system of wisdom and civilization. It means that a large number of intelligent beings, as many as billions, or even tens of billions, have been brought under their control and cultivated by themselves. How many scientists will be born in this area, and how many scientists will develop their own science and technology. How much impetus is provided?

For Xiao Yu now. This was an unimaginably large amount of wealth, and its value was far greater than the body of an entire fourth-level beast.

"All targets within 500 light-years are completely ruled out, as they are too close to the Merlian civilization and could be dangerous. After 500 light-years of travel, it is time to explore all the stars in the vicinity of the route. Xiao Yu thought secretly. Maneuvering the huge fleet continues to accelerate.

So far, Xiao Yu's speed has reached five times the speed of light. After another period of time, Xiao Yu's speed will reach eight times the speed of light. Xiao Yu didn't think that this fourth-level beast would have the ability to travel at eight times the speed of light, even. Xiao Yu does not think it will have the ability to carry out long-distance detection while traveling faster than the speed of light.

Level 4 civilizations will have the ability to detect faster-than-light, but this detection ability is not based on tachyon technology, they are developed on the basis of reducing light. This kind of detection jishu is quite primitive and rudimentary, basically it can only detect a massive target such as a star or planet, and it is basically impossible to rely on this means to find out a fleet, not to mention that Xiao Yu is now in a faster-than-light voyage, and he does not send any detectable signals at all.

In other words, as soon as you enter the faster-than-light stage, you will basically be safe, and you don't have to worry about being entangled by this strange beast.

"It's the end of the matter." Xiao Yu sighed a little comfortably, cheered up, and started the rest of the work.

There are always so many things in front of Xiao Yu, and the work is always so heavy. But the obsession hidden deep in his heart, as well as the desire to be strong, make Xiao Yu always able to face anything with the most vigorous energy.

Continue to analyze the technology obtained from the Melian civilization, repair the Wanguo Lai Dynasty spaceship, repair the rest of the damaged spacecraft, various scientific research, and in-depth research and development of the negative matter cannon......

The ship's repair has still not been completed, and the scientists who were previously stationed on the spacecraft have been dispersed by Xiao Yu to the rest of the city-level and provincial-level spacecraft, where Xiao Yu has made some relatively simple scientific instruments for them to carry out scientific research.

The process of repairing the Wanguo Lai Dynasty spaceship made Xiao Yu deeply understand how complex the structure of a large spaceship is. A large ship is not a simple accumulation of materials, it is a delicate and coordinated whole, and the slightest change in any one place can affect the entire ship.

This is not the case for repairing one of the ships of the Nations, not to mention the rest of the larger ships. It was only now that Xiao Yu deeply understood this sentence: "The Guardian Civilization Flagship Radiance is seriously damaged, and it is estimated that it will take 30,000 years to complete the repair." ”

It will take tens of thousands of years just to repair, so what about manufacturing? How powerful will the spaceship that took so much effort to build be? The Radiance is already so powerful, so what about the Neutron Battlestar that makes the Radiance have no backhand and can only flee in a hurry?

"It's a long way to go." At this moment, Xiao Yu's heart was full of sighs. But in the face of the long and thorny road ahead, Xiao Yu was not afraid at all, and his heart was full of pride.

"Huh? What is it? When the speed reached the highest speed and drove quickly towards the silver heart, Xiao Yu turned on the tachyon detection instrument to the maximum power, and then, Xiao Yu discovered an abnormal phenomenon.

Behind Xiao Yu's fleet, about 60 billion kilometers away, there is a strange asteroid that is closely following him. This asteroid is about 20 kilometers in diameter, which is unremarkable in the universe. But the most important point is that this asteroid is moving faster than light! Moreover, its speed is the same as the speed of Xiao Yu's fleet, which is eight times the speed of light!

It maintained the same speed as Xiao Yu in this way, not close, not far away, just six tens of billions of kilometers behind Xiao Yu, closely following Xiao Yu.

In an instant, Xiao Yu understood, and he couldn't help but feel extremely depressed.

This is undoubtedly the fourth-level beast. It curled up and traveled faster than light to its external strength, chasing after Xiao Yu.

"This guy, why is he still following me? How can it reach such high speeds? weishenme it can find my trails? ”

Xiao Yu's heart was very helpless. The performance of this fourth-level beast once again exceeded Xiao Yu's expectations.

"Follow me, follow me...... I just hope that it doesn't have the ability to fight at the speed of light, otherwise, I would really be beaten and unable to fight back. Xiao Yu thought, "As long as it doesn't attack me, I can sail this distance with peace of mind, and when it stabilizes in the star system, I have a way to deal with it." ”

Xiao Yu has this self-confidence and this strength. Although the negative material cannon still cannot be miniaturized, the manufacture of a large negative material cannon is not a difficult task for Xiao Yu. As long as you find a star system with abundant materials, use a planet as a carrier, and once again create a large negative matter cannon, you can seriously injure this guy with just one shot.

"I think you don't know the strength of the fifth-level civilization, since you are in a hurry to send you to death, then, your body, I will accept it. After killing you, it's time to use your body to build a new national spaceship. Xiao Yu laughed coldly in his heart.

Faster-than-light travel continues. Within the initial 500 light-years voyage, Xiao Yu's route has probably maintained the shape of a straight line, and will remain so for more than sixty years. In the past 60 years, Xiao Yu has carried out a thorough repair of the Wanguo Lai Dynasty spacecraft, as well as a thorough scientific and technological analysis, and collected all the valuable information. After completing all this, Xiao Yu and the more than 10,000 scientists who belonged to him began a long period of experiments, verifications, calculations, and inferences.

Xiao Yu's level of technology is increasing at a slow, but determined speed.

In the past sixty years, the Molian civilization has not appeared, although the fourth-level beast has been closely following Xiao Yu, but it has not moved, it seems to be just waiting for Xiao Yu to stop, and then attacking Xiao Yu.

It's business as usual.

More than 60 years have passed in a flash. Xiao Yu finally escaped from the danger zone. From this moment on, Xiao Yu's route can no longer maintain the shape of a straight line.

Although tachyon detection can be used at faster-than-light speeds, it also has its own limitations, that is, it cannot detect things that are too far away. And because Xiao Yu is actively looking for a low-level civilization, every time he encounters a suitable star, Xiao Yu has to change his course and get closer to a distance of less than 80 billion kilometers before he can use tachyon detection methods to explore this star system. (To be continued......)