Chapter 84

Therefore, Mars is not the focus of human attention, and there is only such a lonely space city above, mostly in the nature of scientific research and transit stations.

Mars enthusiasts are thinking about melting two levels of carbon dioxide to improve the Martian atmosphere in order to achieve the purpose of livable in the future.

"If there is a population explosion after human civilization and the earth and moon cannot live, it is possible to develop Mars... Compared with other planets, this planet is better for people. At present, no extraterrestrial microorganisms have been found, and the safety is also OK. " Elder martial 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 allowed by natural resources, social system and productivity, of course, the more the better, especially the high-quality population.

But capitalism is a contraceptive for population growth.

In the old times, limited to resource constraints, the earth's population had stagnated at 7-8 billion for a long time.

After the fourth World War and the "light of nuclear fusion", the whole civilization once ushered in a wave of fertility peak. But now, the population growth rate has slowed down again, and the annual growth rate is less than 1%.

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

As for the low-quality population in some countries, it is useless to have more.

Zhang Yuan had a whim: "if in the future, artificial uterus technology and robot rearing are developed, do you think this pattern will be changed?"

Elder martial brother Zhao shook his head: "artificial uterus technology liberates women and is a major technology affecting the process of the whole world. With the technology of artificial uterus, what feminist movement can finally stop. "

"... but I don't think it can change the fundamentals of population growth. Because it is important for children to nurture, not the process of birth. Parenting consumes more energy than life! "

"As for machine raising, what a strong artificial intelligence it needs! Moreover, ethics may be discussed for a long time... "

"On the contrary, I am more worried about the uterine revolution strategy of some small countries. A large number of foreign immigrants will lead to the decline of the influence of the main ethnic groups. The conflict between ideology and culture is likely to make bad money replace good money. This phenomenon has happened many times in history. "

Zhang Yuan sighed, "Alas, indeed."

After visiting the Observatory for a while, Zhang Yuan suddenly found that there was an electronic reading room called "star library", in which a few people were reading.

He thought to himself that those who can enjoy solitude in such a place must be top experts. Maybe you can try it later

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

The terminal of this journey is the tail wing of the mother ship, 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 shock people.

When he saw the giant, Zhang Yuan felt his heart start to get hot.

The long-term work, happiness and sense of achievement here must be much stronger than cleaning the cabin.

On a recent detection screen, a blue and white plasma is discharging, and changes in various parameters are also displayed nearby.

Zhang Yuan narrowed his eyes. He saw a temperature marked above, about 750 million degrees!

"Here you are!"

"Professor Ding."

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

Academician Ding was here to understand the changes of various parameters and happened to meet them.

"Zhang Yuan, it seems that you like it here. To fully understand this big thing, you may have to learn some knowledge of mechanics, nuclear physics and plasma. There are a lot of things to learn. "

Zhang Yuan is naturally quite positive, "what can I do now?"

"Read some papers first. If you don't understand, you can ask your senior brother, or you can monitor the motion trajectory of plasma turbulence here, and study the structure of the whole engine, such as the thermal value of helium cooled solid cladding, the impact of periodic impact on helium turbine expander in low-temperature system, etc. you can choose your own topics, and I will open a certain database permission for you."

"If you fully understand the working principle of the whole engine, the rest of space engineering is a little fun for you."

Zhang Yuan answered and found his seat.

He happily fixed his body on the seat and tried to find some papers in the database.

Here, he can even read the control codes of various machines!

Of course, only read permission, no modification permission.

Zhang Yuan was very pleased to find that his father did a lot of work in the whole nuclear fusion control project. Naturally, his curiosity and desire to try were even greater.

He thought to himself: "the work in nuclear fusion sounds tall. If Li Zhendong meets him, I don't know how long he can boast..."

Nuclear physics, similar to high-energy physics, is a theory that studies micro and deep levels. Nuclear physics tends to be applied laterally, while high-energy physics tends to be a micro deep-seated theory.

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

The main reason is that those who can find out have gradually found out, and those who can't understand still don't understand.

In the 23rd century, the Xia National Academy of Sciences once spent a lot of money to build a larger Collider, but the final result was that it could not hit any more than expected particles, and the project became a classic white elephant project.

The standard model based on non Abelian gauge field seems to be the supremum of human understanding of nature.

According to the estimates of some scientists, if you want to verify a higher-level theory and find some unexpected physical phenomena, you need to build a ring solar system collider! In other words, the length of the collider has to circle the solar system.

For human beings, it is an impossible task.

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

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

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

In the range of 10 ^ 6-10 ^ 7 electron volts, it can be observed that the 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 particles.

The LHC in Europe was able to reach the energy level of 10 ^ 13 electron volts, and the Higgs boson was discovered.

Xia's collider consumed hundreds of billions of dollars and raised the energy level to 10 ^ 15 electron volts again.

so what?

No, then, at 10 ^ 15 electron volts, no new physics was observed

However, the "energy level desert" conjecture holds that there will be no new physical phenomena at the energy level of 10 ^ 24 electron volts. According to the current theory, if you want to continue to study high-energy physics, please raise the energy level a billion times!

This is also the origin of the ring solar system accelerator, which requires an accelerator with a circumference of 100 billion kilometers to do this.

100 billion kilometers!

But that's not all about high-energy physics. A 100 billion kilometer accelerator may only observe the unity of strong, electromagnetic and weak forces, but it has not wrapped gravity in it.

To thoroughly study quantum gravity or the legendary theory of everything, please build an accelerator with a length of 1000 light-years, that is, the ring galaxy accelerator!