Therefore, Mars is not the planet that humans focus on. There is only such an isolated space city above, mostly with scientific research and transit stations.

Mars enthusiasts are thinking about melting two-stage carbon dioxide to improve the Martian atmosphere to achieve future habitable goals.

"If the population explodes in human civilization and the earth and the moon cannot live in it, then Mars can be developed... Compared with other planets, this planet is quite good for living. No alien microorganisms have been found so far, and the safety is OK." Senior Brother Zhao suddenly said.

Zhang Yuan responded: "I think there seems to be no such possibility in the visible future. Because the growth rate of civilized population is not high."

Within the scope permitted by natural resources, social systems and productivity, of course, the more population, the better, especially high-quality population.

But capitalism is a birth control pill for population growth.

In the old era, due to resource difficulties, the earth's population had long been stagnant between 7 and 8 billion.

After experiencing the Fourth World War and the "Light of Nuclear Fusion", the entire civilization once ushered in a wave of fertility peaks. However, now, the population growth rate has slowly slowed down, and the annual growth rate is less than 1%.

It is actually very difficult to grow from the current population of 10 billion to 100 billion or even 100 billion. For many families, having a second child is already a very painful thing.

As for the low-quality population of some countries, no matter how many people are, it is useless.

Zhang Yuan had a sudden whim: "If artificial uterus technology and robot maintenance are developed in the future, do you think this pattern will change?"

Senior Brother Zhao shook his head: "Artificial uterine technology liberates women and is a major technology that affects the entire world's progress. With artificial uterine technology, what feminist movement can finally stop."

"...But I think the fundamentals of population growth cannot be changed. Because what is important for children is raising children, not the process of birth. The energy consumed by raising children is much more than that of childbirth!"

"As for machine support, how strong artificial intelligence is needed! Moreover, ethics may take a long time to discuss..."

"I am more worried about the uterine revolutionary strategy of some small countries. A large number of foreign immigrants will lead to a decline in the influence of the subject nation. The conflict between ideology and culture is likely to allow bad money to replace good money. This phenomenon has occurred many times in history."

Zhang Yuan sighed, "Oh, that's true."

Just chatting about the mountains and visiting the observatory for a while, Zhang Yuan suddenly found that there was an electronic reading room hidden here, called "Star Library", and a small number of people were reading books inside.

He thought to himself that people who can still enjoy loneliness in such a place must be top experts. Maybe they can try it in the future...

After a casual visit, the two turned around and returned to the rail car.

The end of this journey is the tail of the mothership, which is the location of the nuclear fusion engine.

The nuclear fusion engine has a maximum ring diameter of more than 400 meters. Just the tip of the iceberg is enough to make people feel shocked.

When he witnessed this behemoth, Zhang Yuan felt his heart begin to burn.

The long-term work here, the degree of happiness and sense of accomplishment is definitely much stronger than cleaning the cabin.

On a recent detection screen, a blue and white plasma mass was being discharged, and various parameters were also displayed nearby.

Zhang Yuan narrowed his eyes and saw the temperature marked on it, which was about 750 million degrees!

"You are here!"

"Professor Ding."

Seeing a figure emerging from the room ahead, Zhang Yuan quickly said hello.

Academician Ding is here to understand the changes in various parameters and happen to meet them.

"Zhang Yuan, it seems that you like this place very much. If you want to fully understand this big thing, you may have to learn some knowledge of mechanics, nuclear physics, and plasma, and there are a lot of things to learn."

Zhang Yuan was naturally quite active, "Can I do some work now?"

"Let's read some papers first. If you don't understand, you can ask your senior brother. You can also monitor the movement trajectory of plasma turbulence here, and study the structure of the entire engine, such as the thermal value of helium cold solid cladding, the impact of periodic impact on the helium turbine expander in the low-temperature system, etc. You can choose the topic yourself, and I will open a certain database permission for you."

"If you fully understand how the entire engine works, the rest of the space engineering will be of little interest to you."

Zhang Yuan responded and found his seat.

He was excited to fix his body in his seat, trying to find a paper in the database.

Here, he can even read various mechanical control codes!

Of course, there is only the permission to read, but no permission to modify.

Zhang Yuan was very happy to find that many of the tasks in the entire nuclear fusion control project were done by his father, and his curiosity and eagerness in his heart would naturally become even greater.

He thought to himself: "The work in nuclear fusion sounds high-end. If Li Zhendong meets him, I don't know how long he can brag about it..."

Nuclear physics, similar to high-energy physics, is a theory that studies the deep microscopic level. Nuclear physics tends toward the lateral application direction, while high-energy physics tends toward the deep microscopic level.

But in this era, high-energy physics began to decline gradually.

The main reason is that those who can figure it out clearly have gradually figured out, and those who can't figure it out still don't understand it now.

In the 23rd century, the Xia Academy of Sciences spent a lot of money to build a larger collider, but the end result was that no particles that exceeded expectations could be knocked out, and this project became a classic white elephant project.

The standard model established based on non-Abelian normative fields seems to have become the upper boundary for humans to understand nature.

According to some scientists' estimates, if you want to verify higher-level theories and discover some physical phenomena that exceed expectations, you need to build a ring solar system collider! In other words, the length of this collider must circumnavigate around the solar system.

For humans, it is an incomplete task.

This conjecture is called the "energy-level desert" conjecture.

Matter in nature will have completely different properties under different accelerator energy.

At the energy of 10 electron volts, one can observe the atom disintegration and decomposition into atomic nuclei and electrons.

In the interval of 10^6-10^7 electron volts, people can observe that the atomic nucleus disintegrates again and decomposes into neutrons and protons.

At the energy of 10^11 electron volts, electrically weak particles can be observed, that is, the proof of the unified theory of electrically weak.

The lhc in Europe was once able to reach the energy level of 10^13 electron volts, and Higgswagen was discovered.

Xia Guo’s collider consumed 10 billion yuan of funds and once again increased its energy level to 10^15 electronic volts.

Then what?

Nothing happened, under 10^15 electron volts, no new physics was observed

However, the "Energy Level Desert" conjecture believes that under the energy level of 10^24 electron volts, there will be no new physical phenomena. According to the current theory, if you want to continue to study high-energy physics, please increase the energy level by billions!

This is also the origin of the accelerator of the ring solar system, which requires an accelerator with a circumference of 1000 billion kilometers to achieve this.

100 billion kilometers!

But this is not the whole of high-energy physics. A 1000 billion-kilometer accelerator is likely to only observe the unity of strong, electromagnetic and weak forces, and has not yet wrapped gravity.
Chapter completed!