After receiving this message, Xiao Yu's first reaction was: "Who is this guy, and how does he know that I came here?" Could it be that this is the owner of this stargate, who is monitoring my movements in real time? ”

The second reaction was to immediately analyze the message received. Xiao Yu tried to find out where this message was sent from, by what means, what identity the sender was, and what level of technology. But unfortunately, Xiao Yu didn't find any relevant information. This information suddenly appeared in Xiao Yu's brain.

Xiao Yu was quietly waiting for the follow-up information to arrive. But Xiao Yu was disappointed, Xiao Yu waited for several hours and did not receive follow-up information. This guy who doesn't know what his identity is, the first time Xiao Yu came to this strange river system, he sent such a message with no beginning and no end, and then disappeared completely.

In Xiao Yu's heart, many thoughts were rolling. A large amount of logical information is entangled with each other, trying to find out the secret behind this information.

"It seems that the name Sweeper is not a specific reference to a certain civilization, but a general term for a type of civilization, just like the Taihao civilization?" Xiao Yu thought incredulously, "Could it be that every river system will have a Sweeper civilization?" And what about the Guardian civilization? I became a sweeper civilization, so where did the original sweeper civilization of this river system go? ”

Xiao Yu was thinking about a question, that is, what exactly does the Sweeper civilization mean.

"Obviously, it can be analyzed in the literal sense that the Sweeper civilization is responsible for cleaning up intelligent beings within the confines of a river system. Coupled with my understanding of the Guardian civilization - the Guardian civilization destroys civilization by depriving civilization of its development potential, and the Sweeper civilization destroys civilization through violent destruction, the two work together to lock all civilizations in a river system to a way out. If it weren't for the fact that I had some adventures. Standing on the shoulders of at least seven powerful beings, then I would have been wiped out by the Sweeper civilization long ago. ”

"However, if luck doesn't exist at all, then why would the Sweeper civilization and the Guardian civilization do this? Is it interesting to destroy the rest of the civilizations? ”

Xiao Yu began to think about some more profound questions. After discovering that it was very likely that the rest of the river systems also had the Sweeper Civilization and the Guardian Civilization, Xiao Yu realized that there were some problems that were not as simple as he imagined.

"That inexplicable guy said that I have become the sweeper civilization of this river system, it seems that the sweeper civilization is a title, not a civilization is born a sweeper civilization. It is a deliberate selection of civilizations that exist among many candidate civilizations. It is very likely that the Sweeper civilization of the galaxy came into being through such a process. So, what responsibilities and obligations do you need to bear to become a cleaner civilization, and what are the rewards and restrictions? ”

"It is clear that the responsibility and obligation of the Sweeper civilization is to exterminate the inferior civilization. So what are the rewards and limits? Could it be that the reward is the qualification to become a seventh-level civilization? So it seems. That inexplicable guy. Will it be the invigilator? Well, if that's the case, it's easier to understand that the Sweeper civilization has a neutron battle star, and the Guardian civilization has a four-dimensional jump, because the existence that specifies the nature of these two civilizations must ensure the absolute superiority of these two civilizations in the river system. And that's exactly what happened. The Sweeper civilization has dominated the galaxy for tens of millions of years, and the Guardian civilization is not far behind. ”

Xiao Yu is sketching a terrifying cosmic blueprint in his heart. In this model, every river system with a certain level of intelligence will be designated by a terrifying being as two types of civilization. One is the Sweeper civilization and the other is the Guardian civilization. These two types of civilizations are like gatekeepers guarding the exit of the river system. Any civilization that wants to become a seventh-level civilization, that is, a civilization that crosses this gate, will be severely attacked by these two civilizations.

In this process, there are countless lies, countless conspiracies, and the weak civilization that has just entered the interstellar space will easily be deceived by the sweet lies of the guardian civilization when they know nothing about the universe, even if they are lucky, they are lucky not to be deceived by the guardian civilization, and then they will be violently destroyed by the powerful cleaner civilization.

It's a desperate picture. The path for a low-level intelligent civilization to be promoted to a high-level intelligent civilization is almost blocked. They were born in the sense of being destroyed. What awaits them ahead are thorns, without any glimmer of hope.

"Is this what the invigilator does? Not only did it set up so many obstacles at the beginning of the birth of civilization, but after the civilization grew into a sixth-level peak civilization and had the qualifications to impact the seventh-level civilization, it would also personally conduct an audit, and only the civilization that passed its review had the opportunity to become a seventh-level civilization...... What a dark universe this is. Xiao Yu muttered to himself, "It's really not easy for me to go all the way, it's not easy." ”

At this moment, even Xiao Yu himself was a little glad that he could get to where he is now.

"Was that message that popped up really sent to me by the invigilator? Why was he sure I would do what it commanded? Isn't it worried that I'm not going to do my duty as a sweeper? What if I deliberately release water? Or was it already sure that I would do what it commanded? ”

The message sent to Xiao Yu was only a short sentence. There are no prefixes and no follow-up additions.

"What's my handle? Could it be the qualification to become a seventh-level civilization? I haven't become a seventh-level civilization in the true sense of the word, but I think that there is no obstacle on my way to a seventh-level civilization. Don't...... If I don't do my job, will it put some more obstacles in my way? But presumably, I was saved by the Rebel Alliance, and now it is it who has come out to assign me tasks, is this a compromise? The invigilator and the Rebel Alliance have made some kind of agreement, and I'm the pawn to be exchanged? ”

At this time, Xiao Yu thought about a lot of things.

"So what should I do? Do you follow the orders of this inexplicable guy, or do you ignore them? Xiao Yu was thinking silently, "If you don't listen, there will be some risks, and if you obey, you don't seem to be very willing." ”

After thinking for a while, Xiao Yu still couldn't make up his mind. Since he couldn't figure it out, Xiao Yu simply put this issue aside for the time being, and began to observe the environment he was currently in.

Xiao Yu needs to determine where he is now and how far away he is from the Milky Way.

The first thing that was observed was the volume and mass of this river system. Through the high-precision telescope, Xiao Yu determined the distance between the Cepheid variable stars in several satellite galaxies and the river system, and then determined the mass of the river system through the orbits and speed of these satellite galaxies around the river system. The conclusion is that this river system has about twice the mass of the Milky Way.

Through a series of complex algorithms, Xiao Yu calculated the volume of this river system. It was concluded that the river system was about 220,000 light-years in diameter. That's about a little more than twice the diameter of the Milky Way.

Xiao Yu has identified several stars in this river system that are suspected to have been observed before, but it is still uncertain, and these data are still being confirmed. After completing a series of observation tasks, Xiao Yu set his sights on the core of this river system.

What Xiao Yu observed was an astonishing scene.

This river system has two cores.

Normally, a river system has only one core, around which the rest of the stars orbit, such as the Milky Way. This core is usually a massive black hole, as is common in galaxies. But this river system is different.

Of its two cores, one is larger, brighter but less massive. The other core is fainter, but it is very massive, and it is estimated to be about 100 million times the mass of the sun. The gas around this mass core is not dense, so the reaction is more gentle, and therefore more dim.

This is a scene that Xiao Yu is very familiar with. Because when he was still in the galaxy, Xiao Yu had seen the scene here countless times.

This is the Andromeda Galaxy. This point, after Xiao Yu turned the telescope, searched for the image of the Milky Way in the celestial sphere, and confirmed hundreds of iconic celestial objects in the Milky Way, Xiao Yu completely confirmed this.

Above Earth, in a clear night sky, the Andromeda Galaxy can be seen by people with good eyesight. However, in the Andromeda Galaxy, the Milky Way cannot be seen with the naked eye alone. Because compared to the Andromeda Galaxy, the Milky Way is too small, too far and too faint.

"I really didn't expect that after two years of sailing through the stargate, I was ready to come to a completely unfamiliar galaxy, and finally ended up here." Xiao Yu muttered to himself, feeling very incredible in his heart.

"The Andromeda Galaxy...... Two and a half million light-years from the Milky Way. It took me two years to cross this journey, and in this way, the speed within the stargate has reached 1.25 million times the speed of light...... That's really an amazing speed. ”

Xiao Yu was sighing, but he didn't want to receive another message. The way this message was sent was in the form of space broadcasting that Xiao Yu was very familiar with, so Xiao Yu easily determined the source of this message.

"The lower civilizations within the river system, the Sweeper civilization has increased its efforts to clean up the following areas, and your situation may be dangerous. We are the Guardian Alliance, and we can provide you with a safe habitat. Please import the following program into your computer and it will lead you to our Alliance......" (to be continued......

PS: There will be another chapter in a while, about eight o'clock