The human civilizations in this world are interconnected and connected in various ways. If the primitive people on the native planet where Ren Di is located are the first-level civilization, the Hexingmen is connected to the aristocratic family management of the South Ye Kingdom divided by the bronze technology. That family should be level 2, and that family walks four hundred kilometers eastward, which is the territory of the South Ye Kingdom. The kings of the South Ye Kingdom can only be considered level 3 by mastering steel smelting.

The second-level aristocratic family has ten star gates, which sounds like ten, and the size of the star gate is very small. Just as Stonehenge is equal, what the second-level civilization can do on the planet is to open up hundreds of kilometers of land (the size of Henan). This is the most lucky situation. The star gate is located in the alluvial plain or the warm area on the west coast that is passed by ocean currents. If it is unlucky, it is located in the mountainous area.

The second-level forces would not even mine and let it be abandoned. This is the planet where Ren Di first came to see it. The land where the star gate opened on the northern plateau was regarded as a bitter and cold place by the second-level family. The second-level forces theoretically have ten star gates, but in fact, there is no.

First-level civilizations, primitive tribes, were theoretically able to cross the star gate, but in fact, their fur clothes and rock productivity sometimes could not go to places where there was a world gate on this planet.

First-level forces. Without the awareness of establishing a country, second-level forces may have the awareness of establishing a kingdom city-state, but if there is a country next to them, it will automatically be downgraded and become a vassalist.

The aristocrats of the fourth-level civilization were tired of staying in their own country and could go out to visit the third-level forces to enjoy the praise of the third-level kingdom. It was a kind of pleasure that foreigners were in the foreign markets of more than ten miles in Shanghai during the Republic of China period.

When it comes to the fifth-level civilization, it also has its own position and order, and Da'ang is the possibility of squeezing the position of the Iron Tower Republic, so the Iron Tower Republic invades strongly. In fact, Da'ang doesn't know that being in the Iron Tower Republic is also bordering higher civilizations.

The upper and lower levels of civilizations border, and higher civilizations want to meet two conditions. First, they can use the star gate to obtain materials, second, they can monitor the changes of lower civilizations so that they will not let lower civilizations overtake. Third, they do not want to spread their own technology to lower civilizations in exchange.

Therefore, the star gate of the sixth-level civilization is in space and on a rocky space planet. What restricts humans from entering space in the 21st century is not that the space equipment made by humans is not suitable for space, but lacks carrying and lacks large thrust rockets push a large amount of matter into space.

Even if the manned aviation in the 21st century continues to develop, rockets, such as materials engineering, have reached their limits and will not appear anti-gravity. The technology of the thing is more troublesome and the bend is even bigger. It is equally unreliable to count on nuclear power plants in the Bronze Age.

Only after the nuclear fusion is successful will the energy output jump to a level and reach the 21st century China-US power generation. After mass production of rockets such as mature technologies, maintaining the carrying capacity of space is like the train line transportation line level in the 21st century, the space city will appear around the earth, and the physical conditions in this world are too generous to these civilizations.

The sixth-level civilization can board the satellites around its planet. Then choose to build the star gate there. It is impossible to consider the environment like rockets that overcome energy in the Earth's gravitational field, and then settle on outer space planets. Choosing a planet with less gravity can allow thousands of tons of warships to overcome the gravity of the satellite into space. Although the satellite is small in mass, such a large piece of planet-level mineral is enough for humans.

However, the Earth's path that requires opening the energy technology tree to colonize the solar system. The level 6 civilization on this plane can leap through this technical threshold and directly embark on the path of colonization on the planet.

The way Zeye civilization borders the Iron Tower Republic is that the star gate is placed on the moon, the capital of the Iron Tower Republic. For tens of thousands of years, it has even formed a circle of floating objects around the moon, like a tulle covering the planet.

The embassy of the business-selecting civilization on the Imperial Tower Republic is also very special. It is an island on the tropical Hainan Island. The materials dropped from space every year range from tens of thousands of tons and as many as millions of tons. In this equatorial part, you can see the channels for the business-selecting civilization to maintain personnel to and from space.

It was through this channel that Chen Ru and others entered the lower planet below by collecting the infectious and lethality of pathogens in low spiritual environments.

This project is just a project to maintain friendship and communication between Yaggar civilization and career choice civilization, which is equivalent to two primary schools in China and the United States sending exchange students to experience life in the 21st century.

Virus sample selection civilization has been checked. It is not a virus containing heavy nuclear elements, it is just a carbon-based virus. For the sixth-level civilization, only viruses containing heavy nuclear elements can disassemble organic matter and absorb heavy nuclear elements to reproduce in the sixth-level civilization environment are threatening viruses. From an engineering perspective, that kind of virus is like a high-energy nanorobot, which can turn humans into viruses that are neither human nor ghost in a few dozen minutes. That kind of thing disassembles proteins, inserts genes, and then provides genes with the power to synthesize new proteins.

As for carbon-based viruses without heavy nuclear elements as energy, they only dismantle organic matter. The spread of wind and drizzle in water (body fluid environment) is lethal to lower civilizations, and does not have diffusion-killing properties for higher civilizations with good medical equipment.

Chen Ru and others brought these and conducted experiments on lower civilizations, third-level and second-level forces. In the eyes of Accord civilization and career-choice civilization, it is as common as the interns of medical schools to solve the deaths caused by little white rabbits, white mice, and frogs.

The two civilizations are now in a friendly period, and non-governmental organizations on both sides often conduct such low-level scientific research exchanges. Let’s look back at the first meeting between Ren Di and Chen Ru, who was the same person, meeting Ren Di in the form of a big man.

His and Ren Di met by chance, but Chen Ru was definitely not wandering around. The second time, he brought a team to enter, it was still in this name, and it was a purposeful investigation, with the purpose of finding Ren Di.

Now Chen Ru and others have returned to the capital star of the Tower Republic. As for their individual armor and gun equipment, they have been secretly entrusted to the family stronghold of the Tower Republic's Xinxiang Yaggar civilization. Of course, this action is an illegal act, and being caught by a career civilization requires some diplomatic disputes.

Chen Ru and others will be permanently expelled from the territory of civilized civilized employment again. In the territory of civilized employment that cannot enter the territory of civilized employment, they will naturally not be able to reach their subordinate civilized Iron Tower Republic.

Chen Ru and his team changed into casual clothes and carried boxes to test the Venus virus of lower civilizations. They returned to the embassy area of ​​the business-selecting civilization, which is the island. Chen Ru and his team members conducted biochemical monitoring in the fire room and carefully inspected them in the isolation area for seven days. If there is a virus infection in the seven days, the rapid disorder of the body's protein caused by the virus will definitely be reflected.

After this inspection process was over, Chen Ru and others changed into casual clothes, exchanged their passport identities, and lay on the space capsule of the rocket launch tower. As the engine at the tail of the rocket ejected azure flame, the rocket rose into the air and entered space orbit.

After confirming that he had entered space, Chen Ru took a breath through the glass window, looking at the huge planet of the Iron Tower Republic.

He walked to the gate of the space capsule, paused, modified the spacecraft system, and then opened the gate of the space capsule. If the system was not modified, now when he unscrewed the gate, the system would alarm, and the entire cabin would keep flashing red. The scene he did would be recorded by the system of the spacecraft.

After opening the hatch door, light appeared in his palm, and a layer of energy directly restricted the airflow of the space capsule to rush out of the space. Chen Ru walked out of the space capsule, and then the capsule door behind him was tightly closed.

Chen Ruxu stood in space and stood in the air in the atmosphere. He was an innate sign. He did not rely on any maintenance system. He stood in the void in the universe. He could maintain the energy system of the body from the world opened by the star gate in his body. This was the sign of the energy releaser and the energy controller.

Chen Ru is an energy releaser. The huge blue planet on the left of the starry sky is the home star of the Iron Tower Republic, and is constantly moving away while slowly turning.

On the right, there is a white moon shining third of the area by the sun, and the moon of the Iron Tower Republic. It is approaching, and countless stars are flashing on the dark sky. Chen Ru is not enjoying the beautiful scenery. He looks back at the quiet space station in the space orbit of the mother star of the Iron Tower Republic.

All his teammates were stranded in the space station. The space station served as a transit station and reached the moon through the space capsule. Chen Ru searched for this space station in space.

During the process of hesitation, Chen Ru slowly raised his hands. Energy appeared in his palms, and the energy was very concentrated. Finally, this beam of energy was emitted and the target space station. After this beam of energy was shot out, Chen Ru's eyes were replaced by coldness.

Five minutes ago, in the space, players in a separate room were floating in the weightless space, forming a ball.

Team member A said: "Do you think the captain has changed a few times recently?"

Team member B said: "What's wrong?"

Team member A scratched his chin and said, "It seems that he has become particularly concerned about us."

Team member B said: "The captain has always been very good."

At this time, team member C interrupted and said, "It's very good now. You didn't see the captain or the anxious look of us. He could have left first in the space station. Now he has been waiting until our team has arrived at the space station before he takes the first return capsule back."

Team member A said, "But I always feel it's a little weird."

Team member Ding floated in the cabin like he was swimming in the water, patting A's head with his hands and said, "Don't think about it."

Jia let out a painful cry and made a mental effort to educate Ding. At this time, the red alarm in the cabin was meditating. It was like the sound of a pressure cooker bursting in the cabin. A large hole appeared in the cabin. A large amount of airflow was lost to the outside of space.

After fifteen minutes of the camera switched to, watching the blazing flames appear in the space orbit where the space station is located, Chen Ru stopped projecting energy there. He opened the capsule without looking back and returned to the capsule. He no longer took a look at the tragedy in the space behind him.

Maybe it's coldness, maybe it's guilty.
Chapter completed!