"Alin, thank you!"

Shen Yuan looked into the distance and sighed softly.

Pang Xuelin said with a smile: "Teacher, don't think too much, as long as we can accurately locate the Sunset 6 in the center of the earth, I am confident that the Sunset 6 will be rescued from it within ten years!" ”

Shen Yuan smiled bitterly: "How can it be so easy, even if we are accurately positioned, we have to develop a ground core spaceship!" Although the existing new solid material can be used as the shell of the core spacecraft, this material is too heavy, and our engines can only barely propel it to navigate in the mantle, but inside the core, it is difficult to move an inch! Now it would be nice if we could develop a nuclear spacecraft engine that meets the requirements in ten years! ”

Pang Xuelin smiled and suddenly said, "Teacher, if the development of the engine is too difficult, then why don't we try to reduce the mass of the spacecraft?" ”

Shen Yuan shook his head and said: "How can it be so easy, the material technology we have mastered, and only this new solid-state material can adapt to the high-temperature and high-pressure environment inside the earth, and others, such as carbon nanotube materials, although the strength is enough, but they are not resistant to high temperatures, and they have no effect." The only weakness of the new solid-state material is that it is too heavy! Even with a high-powered fusion engine, it can only barely propel it forward in the mantle! ”

Pang Xuelin said: "Teacher, have you ever heard of strong interaction materials? ”

"Strongly interacting materials? Are you talking about neutron materials and quark materials? ”

Shen Yuan was slightly stunned.

Pang Xuelin shook his head with a smile and said: "No, this substance is comparable in mass to ordinary matter, but its molecular structure is firmly locked by strong interaction forces, and the vibration is almost zero, and its strength is even higher than that of the new solid-state material, but the density is one to two orders of magnitude lower than that of the new solid-state material!" ”

"Arin, are you sure this material exists in the world?"

Shen Yuan frowned.

The material that Pang Xuelin is talking about is a bit beyond the physical principles he can understand, and is more like the field of metaphysics.

If someone else had said this to him, Shen Yuan would have already walked away.

But this person was Pang Xuelin, who had only discovered inert neutrinos not long ago, and Shen Yuan had to pay attention to it.

Pang Xuelin smiled slightly, the reason why he mentioned strong interaction materials, Pang Xuelin was not a whim.

On the one hand, in the dark forest world, human beings already had certain ideas for the research of strong interaction materials, and even completed the preparation of strong interaction materials in the laboratory.

The earth cannon world has developed normally until 2075, and all aspects of technology are enough to support the research and development of this material.

Pang Xuelin can completely draw a gourd in the same way and find a preparation method for this material in the earth cannon world.

On the other hand, Pang Xuelin is also doing tests.

He wanted to see if the essential laws of the universe were the same in Da Liu's science fiction universe.

As long as the basic laws have not changed, then the various black technologies obtained from Da Liu's world can naturally be used for trial.

The strong interaction material originates from the water droplets of the detector of the three-body civilization in the world of "Dark Forest".

In the world of "Dark Forest", Da Liu's description of water droplets is like this.

[The size of the detector was about the same as expected, 3.5 meters long, and when Ding Yi saw it, he had the same impression as everyone else: a drop of mercury. The detector is perfectly shaped as a droplet, with a round head, a pointed tail, and an extremely smooth all-reflective surface, with the Milky Way reflecting a smooth pattern of light on its surface, making the drop look simple and beautiful. The shape of its droplet is so lifelike that observers sometimes think it is liquid, and there is no internal mechanical structure at all.

"What is its mass?" Ding Yi asked.

"At present, there is no exact value, only a crude value obtained by a high-precision gravimeter, which is about ten tons."

"Then at least it's not made of neutron star matter."

"I can only guess." Ding Yi raised his head and said, "The molecules of this thing are neatly arranged like an honor guard, and they are consolidating with each other at the same time, do you know how strong this consolidation is?" As if nailed to death, the molecules vibrate themselves. ”

"That's why it's at absolute zero!" Xizi said that she and the other two officers understood what Ding Yi's words meant: In matter of ordinary density, the nuclei of atoms are so far apart that it is not much easier to fix them to death than to fix the sun and the eight planets into a set of stationary street frames with a set of connecting rods.

"What force can do this?"

"There is only one kind: the strong interaction force can be seen through the mask," Ding Yi's forehead was already covered with cold sweat. 】

Shortly after this conversation, the droplets began their campaign of destruction against the Combined Human Space Fleet, and the destruction of the human fleet plunged humanity into an unprecedented panic.

A substance that is not in the state of a neutron star, not very heavy, and the material is still smooth after being magnified 10 million times, with orderly molecular arrangements and no vibrations.

According to the research of scientists in the world of "Dark Forest", this material does not exist in its normal state.

This has to start with the basic composition of matter.

As we all know, matter is made up of atoms, which can be decomposed into nuclei and electrons, and nuclei can be decomposed into protons and neutrons, which are collectively called nucleons.

Protons and neutrons can be divided into quarks in turn.

This is the limit of what humans have been able to decompose particles so far.

Even the geosynchronous orbital accelerator can't let the quark continue to decompose.

Quarks can combine with each other to form composite particles.

After a lot of research by scientists, it has been found that the quark combinations in the universe are generally three-quarks composed of protons and neutrons, and no four-quark, five-quark or more quark combinations have been developed.

However, we can theoretically infer the properties of four-quark and five-quark particles.

When such particles are kept at a certain distance from each other, a strong interaction force can be generated.

Strong force, electromagnetic force, weak force, and gravitational force are the four basic forces that maintain the existence and motion order of the universe, and these four forces determine the hardness of matter.

If the hardness index given to a substance by electromagnetic force is set at 1, then the hardness index given to a substance by the weak force and gravitational force is almost negligible, while the hardness index given to a substance by strong force is indeed 100.

Scientists in the world of "Dark Forest" have found that in the protons and neutrons of the three quarks, the strong force only exists inside the protons and neutrons, but for the particles of four quarks or five quarks, the distance of the strong interaction force can be increased by one or two orders of magnitude, reaching the range of 10^-13 meters.

In this case, the atoms and molecules composed of four quarks or five quark nucleons can be firmly locked to form a strongly interacting material.

Pang Xuelin explained the general principle of the strong interaction material to Shen Yuan, and Shen Yuan was dumbfounded.

"But, Alin, even if this material exists, where do we go to find four-quark, five-quark atoms and molecules? Is it a chance to use a collider to drive hadron collisions every day? The four qualk and five quark atoms obtained in this way are probably only a drop in the bucket. ”

Pang Xuelin smiled slightly and said, "Teacher, if a month ago, you asked me to prepare four quarks and five quark substances, I'm afraid I wouldn't be able to do it, but now, it's not difficult!" ”

"What do you mean?"

Shen Yuan looked at Pang Xuelin puzzled.