The formula that appeared in the holographic projection instantly touched Lü Yongchang's DNA.

The Grand Unified Theory, or more accurately, a part of the Grand Unified Theory.

A large blank space is left below the projected text.

It's obvious.

This is what is known as the code—completing the Grand Unified Theory.

The records left by the Enroget civilization also prove this point.

Only civilizations that have mastered the theory of Grand Unification are qualified to enter this site!

Looking at the shimmering white text in the deep blue holographic projection, doubt welled up in his mind again.

If this is a test left by an advanced civilization, then what is its purpose?

Inheritance?

It's unlikely.

Judging from the history of human civilization, even advanced civilizations could not be so selfless and noble.

The world is bustling, all for profit; the world is in turmoil, all for gain.

Even a civilization that has reached level eight, the Cleaners, still has its own purposes and intentions.

And as for pastoral civilization... needless to say.

[The painting] I still vividly remember what I did back then!

Thinking of this, Lü Yongchang became extremely vigilant.

He pondered for a moment, then raised his hand and began to write and draw with remarkable skill on the holographic projection in front of him.

For Lü Yongchang, the derivation process and conclusions of the Grand Unified Theory have become muscle memory.

Before long, neat and aesthetically pleasing formulas and calculation processes appeared rapidly in the huge holographic projection.

When the last character was played, Lü Yongchang let out a long sigh of relief.

"Zero, send it out."

"Use the same encryption method and communication frequency."

"receive."

The moment the electronic synthesized sound rang out, the experimental ship located on the surface of the ruins emitted electromagnetic wave signals towards the enormous wall that stretched from the sky to the ground.

The orange-yellow light that permeated the "space between heaven and earth" flickered slowly a few times, as if an internal program was approving the answers submitted by human civilization.

Even though they knew they had submitted the correct answer, the atmosphere inside the Earth became inexplicably tense.

suddenly.

The orange-yellow light stopped flashing, and the thick, tightly closed wall slowly opened under the influence of the unified field.

The orange-yellow light stretched out, revealing the spacious interior to human civilization.

...

It was a space filled with mist.

The milky white fog was very thick, but under the light from an unknown source, it took on a strange orange-yellow hue.

The mist seemed to be restrained by some force field, and did not dissipate outside the gate.

It simply rolled and tumbled quietly inside the gate.

It was beautiful, but it also made Lü Yongchang feel a little worried.

This environment with extremely low visibility undoubtedly greatly increases the danger and difficulty of exploration.

The unified field strength of the traction test ship did not weaken in the slightest, and the test ship, which was firmly locked, could no longer fly.

It seems that warships are not allowed to enter this internal area.

At Lü Yongchang's instruction, Zero controlled the research robot to leave the experimental ship and boarded the planetary landing vehicle, heading straight for the gate.

The moment it came into contact with the fog, the scientific research robot had already completed the sampling and analysis, and the results were simultaneously displayed inside the "Earth".

"Hydrogen, helium, ammonia, methane, water..."

Lü Yongchang softly repeated the data from the research robot.

This complex gas contains a large number of small droplets and suspended matter, which is why it appears milky white (the orange-yellow color is only due to the reflection of light).

He raised an eyebrow, a flash of inspiration crossing his quantum brain.

seem……

It's somewhat like the upper atmosphere of a gas giant planet.

However, unlike standard gas giants, the atmosphere here is more like that of an ice giant.

Could it be that... the home planet of this advanced civilization is an ice giant?

The thought immediately flashed through Lü Yongchang's mind.

But problems also arose.

The scale of this ruin far exceeds the limits of an ice giant, unless...

Besides the ice giant, its interior also has a large number of "empty areas"!

Thinking of this, Lü Yongchang subconsciously moved his fingers to create a mathematical model and attempted to analyze the internal structure of this planetary fortress using the existing information.

...

The research robots that entered the fog quickly dispatched a large number of micro-drones to attempt to explore and model this vast space.

Meanwhile, research robots stationed outside the site are analyzing and studying the building materials of the ruins.

As the probe data gradually came in, a slightly noisy discussion gradually arose in the Earth command center.

"this……"

"The detectors from the Cleaners civilization use the same materials technology!"

Tao Yuda exclaimed in surprise: "They are all materials with strong interaction forces!"

Lü Yongchang's expression darkened slightly.

Perhaps because the deterrent effect of that detector was too great, looking at this extremely powerful material, he couldn't help but feel a little uneasy.

The simplest understanding of strong interaction materials is neutron star matter.

A large number of neutrons are forcibly squeezed together, with no gaps in between, thus forming dense matter.

This is why matter composed of strongly interacting materials has one of the simplest characteristics—smoothness.

There are no bumps on the surface, not even at the atomic level!

Its extreme smoothness and density also result in its extreme material strength.

Of course, if you ask whether there are even stronger materials...

Of course.

It's still a material with strong interactions, except that the material uses quarks instead of neutrons.

This is quark matter.

It is denser than neutron star matter, and undoubtedly also stronger.

However, the materials used in this site clearly do not meet that standard.

Based on the detection data transmitted back by the scientific research robot.

It simply uses a layer of dense neutrons to construct a particle-level protective film, while its internal structure still uses conventional materials.

This precisely explains the quality issue of this site.

Manipulating the strong interaction force to form a dense protective film of neutrons...

This action is not strange; in fact, it is quite normal.

After all, if it were entirely made of neutron star matter...

That's practically like driving around in a neutron star!

Wow, that power...

Any fancy weapons would be a burden to it; as an extreme celestial body, its own weight and sturdiness are its most powerful weapons!

Let alone planets, even stars cannot withstand its impact!

"drop!"

A crisp reminder sounded, pulling Lü Yongchang's thoughts back from the distant horizon.

The research robot that ventured deep into the outer area of ​​the ruins sent back good news!

P.S.: I'm a bit busy today and don't have time to write.

I'll finish the other chapter tomorrow during the day QAQ...