While Lu Yu was listening to No. 7's explanation, on the Blue Star, a special alarm sounded at Base Zero.

The hosts of almost all the projects put down their affairs at the first time and came to the meeting hall of Base Zero, where many professors and many indescribable Huaguo University elders who had not had time to come back were participating in the meeting remotely through virtual reality.

"A fleet traveling at the speed of light is heading towards the solar system?"

"Arriving in 15 years!?"

As the materials were pushed onto the projection screen in front of everyone, there was a moment of silence before the entire council chamber was filled with the sound of discussion.

Everyone knew that the humans of Blue Star would encounter an alien civilization sooner or later, but they didn't expect this day to come so suddenly.

"Moving at the speed of light......... Does it mean that the technical level of this fleet has only reached level four? ”

"After all, the fifth-level civilization already has a curvature engine, and it can completely advance in a faster and more efficient way!"

An expert sitting in the front row took the lead in asking the question that everyone was most concerned about - what level of civilization is this fleet of the solar system that is about to arrive!

With Base Zero mastering the database of fourth-level civilizations, human beings have begun to have a relatively preliminary understanding of fourth-level civilizations, but fifth-level civilizations ..........

Recalls the weapons that Lu Yu encountered when he was civilizing the Dyson sphere, antimatter missiles, gravitational bombs, and so on.

The other party only needs to throw the two known weapons into the sun, and it is no exaggeration to say that if this fleet is at the technological level of a fifth-level civilization, then there is no room for resistance for human beings at all.

Before, when I watched the Silver Star slaughter from a distance, I didn't have any intuitive feelings about the fifth-level civilization, but now I have a feeling of eating melons and eating them on my head, only to suddenly find that this big melon is so heavy.

"All the information now is only from the system's mission prompts, and the most important thing for us now is to determine which direction this space fleet is coming from!"

"Then there can be a real basis to judge that it is a level civilization, and then extend to the purpose of their coming to the Blue Star!"

After Professor Mao, who presided over the meeting, answered this question, the conference hall was buzzing again, and the news of the visit of the alien civilization was still too shocking for the current human race.

Now human civilization is at most the early stage of the second level, and there is still a long way to go before the second level of civilization in the space city is established like the horn tribe and the space elevator.

In another hundred years, or even another three hundred years, if this space fleet arrives, they will not be so passive.

"The Silver Star!

If the Silver Star is here, our initiative will be greatly increased. ”

"Will Lu Yu be able to rush back to Blue Star within fifteen years?"

Soon, someone thought of the strongest combat power of the human race now, and as soon as he said the [Silver Star], the worried and panicked expressions of many people immediately eased a lot, as if they had rediscovered their spiritual pillars.

“.........”

Professor Mao was silent for a moment before he spoke: "We have completed the basic proofreading of the star map obtained from the Qing clan, and a fact that we have to admit is in front of us. ”

"The galaxy clusters above do not match any of the galaxies that we humans have observed, and the scale of the universe is far wider than the 93 billion light-years that we humans can currently observe."

"The Silver Star has been in space for nearly 6 years, and the exploration of the universe is likely to be just a drop in the ocean. Given another 15 years, can more than 40,000 jumps really find a star path back to Blue Star? ”

"Fellow citizens, please don't leave anything to chance!"

If it was before, when human beings had not even been able to break through controlled nuclear fusion, and other stellar civilizations came, human beings couldn't even grasp the moon, and could they still prevent others from reaching the solar system?

Moreover, a mere first-class civilization, a stellar civilization may not look down on the humans on the blue star!

At that time, even if an alien civilization is discovered, what can it do? I can only close my eyes and be an ostrich, hoping that people are just passing by.

Pray that the solar system is just the most ordinary kind of thousands of star systems, and don't have any scarce resources, so that the stellar civilization will move the idea of bringing [democracy and freedom] to the indigenous civilization.

But now it's different.

With Lu Yu, human beings have a window to observe the civilization of the universe, and the current Base Zero was born.

It has a scientific and technological database of a fourth-level civilization, and now it is constantly supplementing the scientific and technological achievements of a third-level civilization from the lizard civilization, and the current human beings are really just lacking time, and they can't only entrust the survival of the civilization to the weak humans of the high-level civilization [goodwill].

Moreover, the planetary-level civilizations that humans have seen from Lu Yu's journey, the horned tribe and the lizard civilization, seem to be relatively miserable.

One was simply wiped out, and the other was trapped and died in the Black Domain.

The civilization stage of the universe seems to be accessible only to stellar civilizations, and planetary civilizations can only be red carpets for characters to step on on the stage.

It is precisely because of this understanding that everyone has to carefully deal with the information revealed by this system task prompt.

"The story of the Horn Clan is still vivid!"

"We must not allow humanity to repeat the mistakes of the past!"

"Even if the civilization in the universe is not a hunter with a gun, we cannot rely on the existence of [goodwill] in another civilization."

Everyone who can enter the council hall knows the situation of the cosmic civilization, and the fragility of the planetary-level civilization is something that everyone can see after opening their eyes to the universe.

Any planetary catastrophe, such as a planetary impact, such as a sudden change in the environment caused by stellar activity, can change the course of a planetary civilization.

Even a few light years away .... The evolution of a large celestial body dozens of light-years away can affect or even destroy a planetary-level civilization, which is a helpless place that can only be confined to one star field.

And when it comes to stellar civilizations, there is no longer a need for the so-called home star, and the home star can be recreated wherever the spaceship goes, and as long as there are enough spaceships, the entire civilization can survive in space.

Human beings could have reached such a level of civilization without any problems, and once thought that they could give enough years to be civilized, but suddenly variables disrupted all plans.

"Since it's moving at the speed of light, it means that the fleet will slow down accordingly before approaching the solar system, and as long as we can lock in the direction they are heading, that fifteen years is enough time for us to do something!"

"We propose that whatever purpose they come to the solar system, they must be blocked in the Oort Nebula!"

"In the next fifteen years, we will build a Great Wall of Space to defend the Blue Star in the Ke Yin Bo Belt to guard our only home!"

【Great Wall of Space Project】

Professor Mao, who presided over the meeting, showed on the huge projection screen behind him, showing that these few big characters seemed to carry the survival and rise and fall of human civilization fifteen years later.