[PS: All the science fiction technology in this chapter is the author's unscientific brain hole, don't tell the author any scientific truth, even if you do, I pretend not to see it. 】

Although facing the threat of starry beasts, humanity did lose a large number of planets at the beginning of the space age, but with the appearance of the starship girl, the pace of human expansion began to move forward without stopping.

For example, at this time, the Zhiyuan Star where Liunian Feng is located, 3,000 years ago, Zhiyuan Star was still a marginal planet more than a thousand light years away from the Earth, and it was the outermost boundary of the human cosmic empire.

But with the passage of 3,000 years, Zhiyuan Star has changed from the original frontier of mankind to one of the core areas of mankind. For example, 3,000 years ago, Zhiyuan Star was like the Himalayas on the border of the motherland, and now this Himalayas has become the three-ring area of Yanjing City.

At this time, the real frontier of the human empire is already 12,000 light-years away from Zhiyuan, which is only a border area that can be fully controlled, and if the war zone that is not completely controlled but has established an outpost, the distance from Zhiyuan is already more than 60,000 light-years, almost half of the galaxy is included in it.

In such a huge cosmic empire, a super-large inhabited planet with a population of more than 1 billion people like Zhiyuan Star is separated by tens or even hundreds of light years between the two sides, and if you want to use conventional navigation methods, I am afraid that it will not be possible to reach the closest planet to Zhiyuan Star in hundreds of years.

Of course, it is impossible for human beings to move between each planet in this way, thousands of years ago, human beings have mastered the method of hyperspace travel through wormholes, but wormholes are very unstable, and the exit of wormholes will continue to change.

What's even more terrifying is that wormholes are also very easy to collapse...... Once the collapse occurs, the battleship sailing in the wormhole will be lost in subspace forever and never come out again, which is simply more cruel torture than death.

Fortunately, with the continuous development of science and technology, human beings now have the technology of wormhole transformation, which can stabilize the structure of the wormhole through quantum equipment, and stabilize the entrance and exit of the wormhole in a certain position in the universe through transformation, which will not change easily, which is the interstellar gate technology of human beings.

With the passage of time, the Stargate technology has evolved from the original only to stabilize the wormhole to the point where it can expand, shrink or even close the wormhole, it can be said that the wormhole has become the safest travel channel for human beings, according to authoritative statistics, the chance of death in the wormhole is lower than the chance of choking to death after eating.

Generally speaking, the passage of the wormhole is stable to a size that can accommodate the free movement of two space carriers at the same time, and such a passage size is also the most cost-effective size with the smallest energy consumption, and it is also enough for civilian and military warships under normal circumstances.

But today, this stargate, which has been stable at a normal size, suddenly began to expand violently, and in just ten minutes, it changed drastically, as if it had changed from a passage the size of a ping-pong ball to a passage the size of a basketball, capable of accommodating ten helicarriers at the same time, which is also the maximum that the stargate can maintain.

The drastic changes caused by the expansion of the Stargate also directly caused all the quantum-related equipment on Zhiyuan Star to be in an unstable state, and at the same time, even the nearby light was all absorbed by the wormhole, so that the world was in a dark state.

Humans had to temporarily shut down their quantum devices to avoid great danger, which is why Liu Nian Feng was forcibly kicked out of the virtual cabin.

As for why the Stargate began to expand, although Liu Nianfeng didn't know the exact news, he could guess that it was none other than those admirals guarding other planets who were gathering through the Stargate and rushing to this Zhiyuan Starship Girl Academy.

Although those admirals who graduated from the academy were assigned to various planets on the border line to guard the borders of mankind, and it seems that they have disconnected from the academy, these admirals are at the forefront of the battle, and there will be various battles almost every month, and it is inevitable that there will be the tragedy of the death of their own starship girls.

Even if the starship girls are fine, the Commanders' bee value is constantly increasing, and more slots can be added to accommodate more starship girls...... It is undoubtedly a very difficult thing to get excellent starship girls on the border line, so for these star admirals, there are generally two ways to increase their own starship girls.

The quickest way to do this is to head to the Public Fleet and pick the Starship Girls from among the Starship Girls who don't have Admirals.

This seems to be the best way, because the starship girls in the public fleet have often experienced very brutal battles, have rich combat experience, as long as they join the town guard, they can quickly adapt to the battle, this is undoubtedly the best source of soldiers for the admirals.

However, in reality, the Admirals of the Stars do not like to go to the public fleet to choose Starship Maidens for many reasons, but there are only two main reasons.

One is because the starship girls in the public fleet are all starship girls with poor talents, otherwise they would not be assigned to the public fleet, even if such starship girls have enough combat experience, but the upper limit of growth is there, and it is not a good choice for the star admiral who pursues the strongest strength.

The second is because the starship girls who join the public fleet will become more eccentric in character, because of the cruel mortality rate of the public fleet, most of the starship girls will have a strong specificity in the daily guild, and the starship girls who join the town guard mansion halfway often can't really have a heart-to-heart with their star admiral, they are more like mercenaries who need the admiral to pay, and they will not give their sincerity to the star admiral.

In actual battles, there have been countless cases where the entire route of the girl collapsed due to the reckless breakthrough of the starship girl from the public fleet, or the fear of fleeing, so that the entire town guard mansion was destroyed.

Therefore, unless they are really forced to do so, the Admirals of the Stars rarely go to the public fleet to select the Starship Girls, and they prefer to go directly to the Starship Academy to select the Starship Girls who are still on campus, simple-minded and ignorant, have strong manufacturability, and can communicate with the Admiral in life.

Such a starship girl may have a lot of trouble in the early days of joining the town guard mansion, but as long as the admiral teaches carefully, it is easy to become the backbone of the town guard mansion, and she can live and die with the admiral, share hardships and hardships, and after retiring, it becomes natural to live happily together in a lily life.

Just as the admirals in the academy had to wait until the joint entrance examination to be able to select the starship girls, those foreign admirals could only get such a precious opportunity during the joint entrance examination.

However, the foreign admiral is not like the admiral of the academy, the first two midterm exams and final exams have the opportunity to choose, and the foreign admiral only has the opportunity to choose the starship girl in the two final exams every year.

The twice-a-year restriction is undoubtedly very precious and difficult for Admiral Stellar, so every time the final exam is halfway through...... When the exams of those star admirals are over, and the exams of starship girls have not yet begun, these foreign admirals will swarm with their fleets and crowd the starports of various planets.

There is no doubt that these stargate expansions are to facilitate the influx of these admirals into the Starship Maidens Academy.