In the vast universe, a huge fleet was advancing rapidly, and their speed reached 3,000 kilometers per second relative to Tianyuan 4. However, since there is no obvious reference here, they appear to be stationary.

But by observing the redshift and the blueshift, Xiao Yu determined that he was really moving, not stationary.

The stellar light in front of Xiao Yu began to turn blue, while the light of Tianyuan Si behind Xiao Yu became a little red. This is the redshift and the blueshift, because Xiao Yu is sailing forward quickly, quickly approaching the star in front of him, so the light of the star in front of him will turn blue, and on the other hand, because Xiao Yu is moving away from the star behind, the light of the star behind will turn red.

In this vast void, Xiao Yu's fleet was a busy scene. Xiao Yu has built countless robots with basic power structures, shuttling back and forth between large transport ships and large casting ships, carrying a large number of materials into the casting ship, where a larger number of robots are busy. They used these materials through a series of means such as processing, manufacturing, and assembly to create spaceships one after another, which were added to Xiao Yu's fleet.

The number of spaceships in Xiao Yu's fleet is increasing every moment.

Seventeen years have passed since the hydrogen bomb flash was observed, and the total number of spaceships in Xiao Yu's fleet has grown to 110,000, and more than 90 large transport ships have been emptied, and all the materials loaded on them have become spaceships. Xiao Yu began the transformation of the transport ship.

Each of these transport ships will be able to transform into three county-level spaceships, and Xiao Yu naturally can't waste these materials.

It has been twenty-one years since Xiao Yu left the Tianyuan Four Galaxy. In these twenty-one years, Xiao Yu has sailed a total distance of two trillion kilometers, almost one-fifth of a light year.

"In another three years...... In another three years, if Luka's fleet hadn't caught up, I would have been largely safe. Xiao Yu thought silently.

"After arriving at the Tiancang Five star system, it is time to start the research and development of a new fusion engine. The current engine power, and fuel utilization, are not enough to support my ship to reach five percent of the speed of light. This meant that I had to develop a more efficient engine. ”

Although the Lucca civilization is a third-level civilization, their speed has not reached the speed of five percent of the speed of light. Xiao Yu specifically asked Lukka 2 about this, and Lukka 2 replied that they were only third-level primary civilizations, and they were the kind that had just stepped into third-level civilizations, and they probably needed hundreds of years of development to increase the speed of the spacecraft to the point of five percent of the speed of light.

And the pinnacle of the third-level civilization can even reach 50% of the speed of light, that is, 150,000 kilometers per second. Fifty percent of the speed of light is the limit of a ship's normal sailing, and only some special small ships, or weapons or the like, can exceed this speed.

If you want to break through this limitation, you have to find a different way.

"Level 4 civilization is undoubtedly a civilization that has mastered a new type of energy source, because nuclear fusion energy is definitely not enough to support the huge energy demand of faster-than-light travel. Well...... It is very likely that the fourth-level civilization obtains energy through the decay of proton-neutron level matter, which is more than ten times more efficient than nuclear fusion. Whereas...... Within a thousand years, I am confident that I will be able to develop the technology to obtain energy in this way! Within a thousand years, upgrade to a fourth-level civilization! Xiao Yu thought with confidence.

"Lukka Two, today you come to tell me about the composition of civilization in the universe." The work in hand came to an end, Xiao Yu was in the mood and summoned Luka No. 2.

Luca II replied respectfully, "Master, I don't know what you want to know?" ”

"Hmm...... What are the different types of civilizations in the universe, no, in the galaxy? ”

"Within the Guardian Alliance, civilizations are roughly divided into these types, the first is technological civilization, and intelligent beings evolve through the development of technology. The second type is the alien beast civilization, the alien beast civilization has evolved by developing itself, and the alien beast civilization above the third level has the ability to carry out interstellar voyages with its own body. The third is the mechanical civilization, which is developed by the intelligent computers left behind after the demise of the scientific and technological civilization, and the mechanical civilization generally has an extremely large number of warships, like locusts roaming the universe, but they generally have no ability to evolve. Ah, of course this is not talking about you, please don't get me wrong. Luca II spoke, suddenly with some trepidation.

"Nothing, you continue." Xiao Yu said with some amusement.

"These are the three main types, but there are some special beings in the galaxy that are not civilizations, but have certain characteristics of living beings. For example, the nightmare of all civilizations, the Ghost Race......"

"Ghost?" This is the second time Xiao Yu has heard this term, and he can't help but be very interested.

"Yes, Ghost. Ghosts are a special kind of being, they have no substance, just a radio wave-like existence, they are bloodthirsty and powerful, and can evolve by devouring the souls of intelligent beings. The evolution of the Ghost Race to the higher level is extremely terrifying, in the past 70 million years, the total number of civilizations that have been wiped out by the Ghost Race has reached more than 3,000, and there is even a fifth-level civilization. ”

"Ghost?! How is it so similar to the wood spirit? Hearing Luca No. 2's explanation, Xiao Yu was clever, and suddenly remembered the wood spirit that was imprisoned by himself.

Even now, there are still some wood spirits on Xiao Yu's spaceship. However, since Xiao Yu obtained more advanced material casting technology, Xiao Yu has given up the practice of using wood spirits to strengthen materials. Those wood spirits were also put into the storage room by Xiao Yu, and they hadn't asked for a long time.

"The Ghost Race is the common enemy of the technological civilization and the alien beast civilization, and the mechanical civilization has no soul, so the Ghost Race is disdainful of them. Every time the traces of the ghost race are found, it will trigger a large-scale encirclement and suppression in the entire galaxy, 30 million years ago, in the face of an unusually powerful ghost race, the sweeper and guardian civilization even had a precedent of joining forces to fight, just like that, these two civilizations almost failed miserably, zuihou is the sweeper civilization dispatched a neutron war star, only to exterminate that ghost race. Luca II explained in detail.

Xiao Yu thought silently.

"I don't know if the wood spirits are ghosts...... If it's really a ghost clan, then it's a lot of fun, I actually imprisoned such a powerful thing? I can't let the Lucas know about this matter, so I'll study it myself. Xiao Yu made up his mind, and at the same time, raised another question.

"How did the Ghost Clan come about?"

Luca II shook his head: "I don't know. However, there is a certain pattern to the appearance of the ghost race, and the place where they are first discovered is always in the place where there is civilization, but it is extinct. The latest research suggests that the formation of the ghost race may be related to the extinction of civilization. Approximately one out of a thousand extinct civilizations, there will be one Ghost Race. For example, the ghost clan discovered this time was found around a yellow dwarf. The third planet of that yellow dwarf once had a technological civilization. ”

Xiao Yu's heart jumped, and he immediately asked, "Yellow Dwarf?" Give me the specific parameters of this yellow dwarf. ”

Luca No. 2 didn't dare to slack off, and immediately passed a piece of information to Xiao Yu.

Xiao Yu saw that this yellow dwarf star is located in the third cantilever of the Milky Way, with a diameter of 1.39 million kilometers and a mass of 2X10^30 kg......

"This is the sun, the sun that nurtures me." Xiao Yu thought silently.

Xiao Yu manipulated the robot and took out the box where the wood spirit was stored. Through the camera, Xiao Yu watched it silently.

"Could it be...... You are all souls of my people who refuse to rest after they die? On Jupiter, I've destroyed so many Wood Spirits...... Sorry, I really don't know. ”

At this moment, Xiao Yu had mixed feelings in his heart, and he didn't know what it was like.

Xiao Yu barely calmed down and put this matter on the back of his mind for the time being, but continued to ask: "In addition to the ghost clan, what other existences exist in the galaxy?" ”

Luca II replied respectfully, "There are still some unknown and terrible beings. I've heard that hundreds of thousands of years ago, a mighty fleet of 100,000 ships of the Guardian civilization suddenly disappeared around a star in the first cantilever. The Guardian civilization sent a follow-up exploration fleet, but they were also gone. I don't know about the subsequent development, but I only know that the Guardian civilization has divided the Shili range of that star into an extremely dangerous area with a danger level of five. In the galaxy, there are hundreds of danger areas of level 4 and above, and there may be unknown powerful creatures in these areas. ”

"Where's the closest danger zone to me?" Xiao Yu asked.

"Well...... It is an open star cluster, known as the Pleiades in your civilization, about 450 light-years away, and is dangerously level 4, with severe danger. There was once a fleet of Tier 5 civilizations, and when it passed there, all the creatures in the fleet died for unknown reasons, but the ship was not damaged in the slightest. I don't know what the reason is. Luca II replied.

"In the universe, it's really dangerous." Xiao Yu sighed, "I want to continue to be strong, avenge human civilization, and let my people ......rest in peace."

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