Of course, human physicists are far from done with the goal of building a new framework of physics on top of the Standard Model, even in the world of the Dark Forest.

The difficulty is even higher than Pang Xuelin's proof of the Riemann conjecture in the field of mathematics and the complete unification of algebra and geometry.

Therefore, it is very unlikely that this task will be accomplished in the world of Earth Cannon.

Unless the geosynchronous orbital accelerator under construction can smash quarks and fundamentally reveal a completely new world of particles and even strings, then Pang Xuelin will spend decades studying it before it is possible to build a completely new system.

For Pang Xuelin, this does not mean much.

In the world of earth artillery, his priority is to develop strong interaction materials as soon as possible with the help of existing technical means.

Then try to find a way to rescue Shen Jing from the inside of the earth's core.

In the following time, Pang Xuelin began to focus on the research and development of strong interaction materials.

In the Dark Forest World, human beings have completed the research on the technical route of strongly interacting materials, so Pang Xuelin only needs to tinker on this basis, so that the scientists of the Earth Cannon World can also complete the same task under his guidance.

Time passed.

Unconsciously, a year passed in a flash, and it was time to communicate again with Shen Jing.

That morning, Pang Xuelin finished breakfast in the cafeteria and went straight to the neutrino communication center.

At present, Pang Xuelin's place of work has been moved to the Earth Cannon Engineering Science Center near Mohe.

It brings together hundreds of thousands of scientists and engineers from all over the world whose main job is to serve the various scientific problems that will be encountered in the Earth Cannon Project.

Fifty kilometers away from this location is the entrance to the Mohe end of the Earth Cannon Project.

At present, there are two construction sections of the Earth Cannon Project, one starting from Mohe and the other from Antarctica, and the total construction period is expected to be about 25 years.

Among them, new solid-state materials are naturally the top priority.

The density of this new solid-state material is between solid and electron-degenerate materials (white dwarfs, tens of tons per cubic centimeter, and the densest substance on Earth is osmium metal, which has a value of 22.8 grams per cubic centimeter), and its density is three orders of magnitude higher than that of ordinary heavy metals, equivalent to tens of kilograms per cubic centimeter.

The Sunset 6 spacecraft is about the same size as a Boeing 737 airliner in the real world, but because the shell is made of new solid materials, the total mass of the spacecraft is more than 500,000 tons.

In the initial crustal construction stage of the entire earth cannon project, the daily excavation progress of human beings is about 100 meters, once it enters the mantle, with the strong density of the new solid material, human beings can easily use its own weight to sink, and then extract the magma in the tube, by that time, the daily progress of the project will reach the kilometer level.

It is also the earth cannon world that mankind has completed the research and development of nuclear fusion, so that it can support such a majestic super project.

According to estimates, after the completion of the project, there will be several metal and magma mountains at the entrances and exits of the Earth Cannon Project.

……

When Pang Xuelin entered the neutrino communication center, Shen Yuan was chatting with Shen Jing.

Shen Jing on the screen, still wearing thick heat-insulating clothing, does not look much different from a year ago.

"Senior Brother Pang, you're here!"

Seeing Pang Xuelin, Shen Jing's beautiful eyes smiled like a pair of crescents, and there was a hint of surprise in his eyes.

Obviously, Shen Yuan had already told the other party about Pang Xuelin's achievements in the past year.

"Senior Sister Shen, long time no see!"

Pang Xuelin said with a smile.

Shen Yuan said: "Ah Lin, then I will hand over Jingjing to you, you have 24 hours, you take Jingjing to the outside world to see!" ”

"Good! Teacher, then we'll go first. ”

Pang Xuelin took Shen Jing's "eyes" from Shen Yuan's hand, put them on and went out directly.

"Senior sister, where do you want to go this time?"

Coming out of the neutrino communication center building, Pang Xuelin looked up at the sky, today's weather is very good, the sun is shining, and there are no clouds.

"What a blue sky!" Shen Jing took a deep breath and said, "That's good, can you stand still and stop for a while?" I wanted to see the blue sky, and it was a great feeling, like being suffocated in the water and suddenly being able to stick my head out of the water for a breath of fresh air. ”

Pang Xuelin sighed secretly in his heart and smiled: "Okay, you can watch it as long as you want!" ”

Pang Xuelin stood in place for more than ten minutes before continuing to move forward.

Along the way, passing lawns, green trees, wildflowers, birds, and cicadas can all make Shen Jing excited.

Coming to the parking lot, Pang Xuelin drove his flying car into the air, first took Shen Jing to visit the science center of the Earth Cannon Project, and then went straight to the construction site of the Earth Cannon Project!

The earth cannon construction site is on the outskirts of Mohe City, and a huge funnel-shaped pit has been dug at this time, with a diameter of about 300 meters and a depth of more than 100 meters.

Countless construction vehicles and machinery are moving in and out of the construction site, like workers at work.

Shen Jing looked at this huge construction site and was silent for a long time before saying, "Senior brother, I heard my father say, do you really have a way to rescue me from the earth's core?" ”

Pang Xuelin smiled slightly and said: "To be exact, now I just have a better idea, I have discovered inert neutrinos, which can help us accurately locate the location of Sunset Six." There is also a strong interaction material in the works, and I expect it to be successfully developed within three years, and then it will be used in our new generation of ground spacecraft, and then it will be able to save you from that purgatory. ”

Shen Jing sneered and said: "Senior brother, in fact, I'm not so terrible below, it's just that life is a little boring, in addition to recording scientific research data every day, the rest of the time can only read books or something, and occasionally recall the life on the ground, and live quite a fulfilling life." ”

Pang Xuelin said with a smile: "It's best if you have this kind of mentality, junior sister, if you look at it, it's five years fast, ten years if it's slow, and you can experience everything on the ground again!" ”

"Well, Senior Brother Pang......"

"What's wrong?"

"Thank you!"

Pang Xuelin smiled and said: "Senior sister, the family doesn't talk about two families, don't say that you are the teacher's daughter, just your identity as a crew member of the ground-flying spaceship, it is impossible for me to die without saving." Okay, where do you want to go next, I'll take you now. ”

"Hmm...... Let's go see the sea, I want to see the sea under the moonlight, I want to see the sunrise over the sea! ”

"Good!"

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