Reborn again, invincible with 999 lifetimes of memory

While the elder brother and the younger sister were quarreling with each other, Li Chengyu was also observing the aliens' aircraft.

He wanted to find out what level of technology the aliens who invaded the earth had developed in this plane.

So that if there was another large-scale invasion of aliens in the future, he could respond in a targeted manner.

'Well, the other party should have surpassed the extreme of planetary civilization and reached the early stage of stellar civilization. '

After careful observation, Li Chengyu roughly judged the technological level of this group of aliens.

The technology in the universe can be roughly divided into different levels such as planetary civilization, stellar civilization, galaxy civilization, cosmic civilization, dimensional civilization, etc.

Among them, planetary civilization is also called mother star civilization.

At this stage, intelligent races can become the masters of their planets and occupy an undoubted dominant position. No other creatures can threaten them.

At the same time, intelligent races will gradually master all resources and energy on the mother planet through continuous development.

For example, controlling weather changes and changing the natural environment.

Even the changes in the earth's crust can be controlled artificially, thereby completely eliminating natural disasters.

At this time, people's living resources are abundant and they enjoy the best material conditions.

Even their physical condition and life span have been greatly improved.

The current technological level of the earth is in the middle stage of planetary civilization.

As the name suggests, star civilization means that intelligent races can freely roam and dominate the star system through their own science and technology, and control various resources in the star system.

The rare metals, rare earth materials, rare gases, etc. that humans need can be collected by going to different planets.

When human civilization develops to this stage, aerospace has become the mainstream of development.

Everyone can easily cross long distances and go to other planets to mine resources by riding on aircraft.

In this stage, humans will not have the so-called energy crisis at all. The abundant resources in the entire star system make humans simply inexhaustible.

At this stage, everyone is more concerned about how to reproduce their own population.

Then send some people to move to other habitable planets to open up new areas.

As for the subsequent galaxy civilization, universe civilization, dimension civilization, etc., they also represent that humans control everything in different regions and become the undisputed masters.

In the early stages of development, technological civilization was far inferior to immortal civilization.

For example, the five people of the Li family now have only practiced for decades and become ordinary Yuanying masters.

But their own combat effectiveness can easily crush all the high-tech of planetary civilization.

Even the most powerful nuclear weapons on Earth are basically impossible to hurt them.

But once the level of civilization crosses to the star level.

Then artillery fire such as interstellar weapons is no longer something that Yuanying cultivators can contend with.

If the opponent's top weapons are locked and aimed, it will be very difficult for Yuanying cultivators to even dodge.

And when the level of human technological civilization reaches the level of galaxy civilization and universe civilization.

Then even the great cultivators in the world of immortal cultivation need to fight guerrilla warfare with the opponent in order to destroy various high-tech weapons one by one.

Fortunately, these alien civilizations that invaded the earth have just developed to the early stage of stellar civilization.

As long as the other party does not use high-yield weapons and adopts the method of directly destroying the earth to fight.

Then there is nothing to worry about the safety of the Li family.

Even as time goes by, when the cultivation of father, mother, and eldest brother gradually improves.

Even if these alien civilizations invade in large numbers, they have a way to completely destroy the other party.

Even launch a counterattack on the other party's mother planet and completely eliminate all aliens.

"Let's go to the last floor."

"These aliens really disappoint me."

After everyone checked the alien aircraft for a while, they performed the escape technique and sank into the eighteenth underground floor of Area 51.

And here is also the core area of ​​the entire Area 51.

I saw that one figure after another was constantly busy. In the largest laboratories, there were many special forces who volunteered to become experimental subjects.

They lay on the operating table one by one, and the scientific researchers observed the data one by one.

These special forces are the test materials and sources of the American super soldiers.

"Oh, these super soldiers are pretty good."

"Once they are successfully built, their combat effectiveness will be comparable to that of a martial artist at the peak of the Grandmaster level."

After thisAfter so many years of research, the super warriors of the United States have now developed to the seventh generation.

However, in recent years, no matter how hard these scientists have tried, it has always been difficult for the super warriors to break through the bottleneck and enter the stage of martial artists at the grandmaster level.

"It's really good."

"Now the martial artists on Earth, except for those related to our Li family, the strongest ones are still at the peak of innateness."

"Compared with these top super warriors of the United States, they are a big level behind."

Li Zhiyi nodded, with a serious expression on his face.

"Although the super warriors of the United States are powerful, they are born out of high technology after all."

"For all successful super warriors, their strength will not only be difficult to improve in the future, but will even gradually decline."

"The most important thing is that the lifespan of these super warriors is also extremely worrying."

"So far, no warrior has lived for more than ten years after the successful experiment."

Li Chenghao disdained these super warriors.

In his opinion, the other party was just some defective products.

"That's what I said."

"But once the war really starts, the role these super soldiers can play on the battlefield is immeasurable."

"From a military perspective, the United States is indeed at the forefront of all countries in the world."

Li Zhiyi's expression was still very serious.

"Oh, this is not a problem we should consider."

"China has also developed well in recent years, and the gap between it and the United States is getting smaller and smaller."

"Sooner or later, we will catch up with each other."

"Besides, if China really encounters a crisis and is suppressed by the United States, there is no way."

"Can't we take action ourselves to destroy them directly?"

Ye Hongyu interrupted Li Zhiyi's words and didn't take these super soldiers to heart at all.

"Yes, father."

"Don't worry about it."

"As long as we are here, China is at least completely safe."

"Let's go to the other rooms on the 18th floor now."

After Li Chengxin finished speaking, he began to stroll around again.