Chen Xin was dumbfounded, and muttered, "Gangyi, is this your full form after you have been promoted to the fourth level?"

Five years ago, the steel hammer entered the peak of the third level and will be upgraded.

Since it would regain its ontological state after upgrading, Chen Xin simply asked Empress Alice for this ice giant star, which was used as an old nest when the steel hammer was upgraded.

For five years, the steel hammer entered the ice giant star into a deep sleep, and there was no movement.

It wasn't until a month ago that the steel hammer woke up from a long slumber, and it had been promoted to the fourth level.

Only then did Chen Xin decide to leave the Tianqin civilization with the steel hammer and go to the Chaos Star Domain.

He never imagined that after the steel hammer was promoted to the fourth level, it would become so large.

The steel hammer seemed to be very satisfied with Chen Xin's reaction, and laughed, the light around its body distorted, and its body shrank at a speed visible to the naked eye, and finally turned into the appearance of a small machine when Chen Xin first saw it, and got into the Jiangcheng spaceship.

Soon, on the floor of the command center of the Jiangcheng spaceship, a cloud of metal liquid slowly seeped out, and the steel hammer reverted back to the appearance of a machine, and jumped on the command platform with a smile and said, "Old Dou, how is it, I was domineering just now, right?"

Chen Xin rolled his eyes, stepped forward and poked his cold and hard head with his finger, and said, "It seems to be no different from before!"

"Cut!"

Gangyi brushed away Chen Xin's fingers, looked around, as if thinking of something, and asked, "Hey, Lao Dou, why didn't you bring Leah with you when you came out this time?"

Chen Xin rolled his eyes and said, "She is the next heir of the Tianqin royal family, what am I going to do with her!" Don't waste time! I'll leave this ship to you, let's go!"

"No, Old Bean. Why are people so single-minded about you, and you are so ruthless?!"

"Believe it or not, I'm going to beat you up!"

Chen Xin's face fell suddenly.

The steel hammer's electronic eyes flashed, and it laughed, and its body instantly turned into a mass of metal liquid, fusing with the Jiangcheng.

"Old Bean, just kidding, okay, okay. Let's go!"

The curvature engine inside the Jiangcheng was activated, and the starlight outside the porthole gradually turned into a mass of twisted lines, and then the lines dispersed. Only a shattered patch of colorful light remained, and the ship had entered faster-than-light flight.

At present, Jiangcheng is nearly 550 light-years away from New Earth, and Jiangcheng can reach a cruising speed of 120 times the speed of light, while New Earth is only 20 times the speed of light. Chen Xin only needs about five years to catch up with the New Earth.

……

Tempus fugit. Time flies, and before you know it, five years have passed.

During these five years, Chen Xin spent most of his time compiling what he called a compendium of basic theories of physics.

In this work, Chen Xin extended the concept of physics of the second-level civilization, and unified the four basic forces of gravitation, electromagnetism, strong interaction, and weak interaction through the Higgs boson, photon, gluon, and w/z boson in the Guò Standard Model, and used theories and formulas that can be understood by humans to derive the grand unified field theory, and establish a complete mathematical model.

The work is very complex. It involves a variety of basic theories as well as some mathematical calculations.

This work is of great significance to humanity if it can be fully digested. Then before the human race enters the fifth-level civilization, there will be no technological bottleneck, and it only needs to develop step by step to ascend to the fourth-level civilization.

During this time, large-scale construction work was mainly carried out in the Jiangcheng.

The Jiangcheng naturally couldn't move, and the materials of the fifth-level civilization couldn't be digested by the current steel hammer at all.

However, before Chen Xin set off, he had already stored a large number of raw materials of the fourth-level civilization inside the Jiangcheng, which could be used for steel and hammer.

In five years, Gang Gong built nearly 100 meteorite-class and small-planetary warships in the inner dock of the Jiangcheng.

The size of these warships is several thousand meters, and the small ones are only a few hundred meters, and they are involved in various fields of reconnaissance, operations, and escort.

In addition, millions of machines were built, ranging from a few nanometers to more than a dozen meters, for the repair of warships and for internal defense.

Of course, this is only for the training of the steel hammer, but more importantly, it has established a basic spaceship system through these warships and machines, and can be massively expanded on this basis at any time in the future.

After coming out of the Orion cantilever, the Jiangcheng entered the sparse area between the Orion cantilever and the Perseus cantilever.

The material density of this vast star field, which is more than 6,000 light-years wide, is several times smaller than Orion's cantilever and is incomparable to the Silver Heart.

Although most of the Chaos Star Fields are Level 3 civilizations, a few are Level 4 civilizations, and none of the Level 5 civilizations are none, this does not mean that absolute security can be maintained inside the Chaos Star Field.

In fact, due to the existence of the two alliances, the technological blockade of civilizations below level 5 is not strict, and many civilizations at level 3 can buy armaments, technology, and so on from civilizations at higher levels.

This also greatly expanded the activity space of those third- and fourth-level civilizations in the Chaos Star Field, and some powerful fourth-level civilizations in the Chaos Star Domain even had a control radius of one or two hundred light years.

Some civilizations even have Tier 5 civilization warships.

In addition to these low-level civilizations, the Chaos Star Domain is also home to a large number of interstellar pirates and smuggling syndicates.

Due to the countless years of hostility between carbon-based and silicon-based civilizations, there is no official trade between the two sides, but both sides have the resources and commodities that the other needs in their hands, which provides the most basic source of power for smuggling.

In fact, basically every smuggling group has the support of the top civilizations in the two major alliances, and even the Lyra civilization has more than a dozen smuggling groups under its control, and the Carnegie civilization on the cantilevered arm of Perseus 6,000 light-years away maintains trade contacts.

In order to ensure the safety of mankind, the Flame Galaxy arranged by the Lyra civilization for humans is less than three hundred light-years away from Orion's cantilever.

This area is still within the radiation range of the forces of the Lyra civilization, and it is much safer than the depths of the Chaos Star Field.

Moreover, in order to ensure that the New Earth can reach the Flame Galaxy smoothly, the Lyra civilization also secretly arranged four satellite-class warships as escort ships.

But now that Chen Xin has caught up with him on the Jiangcheng, these four satellite-class warships are not of much use, and Chen Xin simply let them go home.

At this time, in a dark void, the New Earth has been detached from the drive of the curvature engine, and is gliding towards the flame galaxy by its own inertia.

And one astronomical unit behind it, the Jiangcheng spacecraft also slowly approached the New Earth with conventional power. (To be continued......)