20 years later.

"Today is the 20th anniversary of the signing of the new covenant of the century, and it is also the 20th year of the new era of Gaia, in these 20 years, Carmon has been unusual, not a single mining area has been robbed, not a single starship has been robbed, and the Carmon people who are engaged in mining in the Gaia area are also behaving well, and there has never been a case of entering Gaia without detection. But we haven't let our guard down in the slightest, the Great Wall of Stars is nearing completion, and today we will welcome the review of Chief Dewey, the commander-in-chief of the Blue Domain in Gaia. Professor Kuibo put down his notes and prepared for a day that would go down in history.

The starship traveled to the boundary of the planet Gaia, the blue ocean was gilded by the sun, and the light of the stars shone on the starship from the side of Phnom Penh, and in the light of Phnom Penh, the Origin carrying the chief and others was the main team to inspect the Great Wall today.

"Good morning, Chief!" Although Kuibo is not a soldier, he also learned from Ouyang Jiannan and others to perform a standard military salute. The huge Pangu stood behind Dewey, returning the salute as if he was about to smash the floor of the starship.

"Thanks to Professor Kuibo's 20 years in Gaia, the Great Wall of the Stars was able to complete the first node so quickly. I have invited you to Gaia for tea many times, and you have been busy with construction, so I had to come over. ”

"It's been my wish for many years to do something here, and I'm grateful to the captain for the opportunity." Dewey had always disliked the title of Führer, and he preferred the title of captain in comparison.

"We'll see as we go, and you'll just be responsible for explaining, not to mention doing any inspections."

"Then I'll start from scratch."

Kuibo opens the stereo imaging system, and the entire map of the Gaia galaxy centered on the star is presented to the entire starship bridge. The crowd besieged the city in a semicircle, with Dewey in the center, Pangu and Kuibo on either side, and Turner, Zhang Heng, Ba Mulin, Gao Liang, and Ouyang Jiannan on both sides.

"The Great Wall of Stars project was conceived 20 years ago, proposed by Dewey, designed by Pangu Xingchang, and designed and built by myself. The main construction content consists of three parts, let's start from the outside in. ”

Kuibo made a gesture, and the star in the center of the semicircle shrank rapidly, and the entire model of the galaxy shrank inward, condensing into a hollow sphere wrapped in a dense mass of stars.

"The outermost layer is the Nebula Defense System, which is also part of the longest construction span, which took a total of 20 years." As Kuibo explains, a string of numbers appears above the hollow sphere: "The nebula is 1 light-year in diameter and contains 129,838,842,6638 million comets, of which asteroids account for about 1.8%. One-third of the stars are from the Gaia system, and the rest are from nearby galaxies. All star trajectories are recorded on the computer, 5/6 of the comets are equipped with propulsion devices that can change their orbits at any time, and the other devices do not operate on their own, and there is no danger of hitting Gaia for 10 million years. ”

"What about asteroids?" Zhang Heng couldn't wait to ask.

"All asteroids have propulsion devices that can not only change orbits, but 2/5 of the planets can track targets with a tracking range ranging from 0.03 to 1 light year."

Gao Liang nodded with satisfaction and asked, "Can I understand it this way, in the absence of a star map, no matter how advanced the starship is, let alone flying at the speed of light here, even if it flies at the limit of supergravity acceleration, it will be hit into a few big holes." ”

"This is true for ordinary starships, but it is not excluded that the battleship's secondary guns will intercept and turn on."

"How do you break it?" Dewey asked.

"I'll answer that." It was Pangu who spoke, who was both the chief designer of the Blue Domain planetary defense system and the designer of the Great Wall of Gaia: "Even if the secondary cannon is opened, it will take a while from capturing and identifying to launching and intercepting, which means that super-light speed flight is not possible, but high-speed flight at the speed of light is possible, therefore, any warship that approaches faster than the speed of light must be reduced to below the speed of light here, relying on this, we have established 8 monitoring stations outside the nebula, which can monitor all spacecraft that are approaching without permission in real time, When the time comes, the data will be transmitted back, and interception will not be a problem. ”

"What's more, even at the speed of light, it would take a year to travel through the entire nebula."

"Well, our starship will be waiting for them in there. And what about the second part? ”

Kuibo magnified the 3D image, and the small black dot in the center slowly magnified into a fine band of light composed of a circular dot matrix.

"I just talked about the situation of starship invasion, but if a large number of starships sacrifice themselves to explode and force their way in, as long as there are enough starships, it can also open a passage for subsequent starships. This Carmon was perfectly capable of doing it, so we designed a second line of defense. A ring-shaped star band named after me. ”

"What does this do?"

"If the Nebula defense system is an obstacle, a slowdown. Then this planetary belt is interception and annihilation. Compared to the comets and asteroids of the nebula, the composition of this line of defense is dominated by large objects. If you want to achieve an invasion by impact, you must at least destroy all of the starships in Kamon. ”

Kuibo gestured confidently, and a string of numbers came out of thin air.

"There are tens of thousands of comets here, more than 6,000 asteroids, and more than 30 large planets of the same size as the planet Gaia, each of which has the ability to track and attack, that is, even if the nebula's defense system is broken, they will still be attacked by these celestial bodies that have calculated their trajectories in advance."

"Anyway, these are rings, not sphericals, what if the enemy attacks from above."

"Kuibo smiled confidently, first, the circular arrangement does not mean that the attack range is also circular, the reason why it is arranged in this way is to facilitate gravitational control, that is, to say second, in the so-called upper and lower directions, I set up a gravitational field trap, once the enemy walks from that side, sorry, the gravitational field is activated, and all starships automatically fall into the ring."

"With these two defenses, they are second to none in the entire universe, and what is the third one."

Kuibo continued to gestur, and the ring changed from dense to sparse, and finally settled on the planet in the outer ring of the planet Gaia, which people call "Mars": "This is not a defense system, but this is part of the defense system, the defense control room, built on the front of the planet Gaia. However, the data processing resources occupy an area of 20,000 square meters. Bigger than any machine room in Carmon and Gaia. ”

"Needless to say, let's talk about surprises." Pangu looked at the countless quantum computer data and was a little impatient.

"The surprise is that the control room is directly connected to the total control of the 8 antimatter planets, and even if the main control room is attacked, the control room on the planet can still control the 8 antimatter planets. This also avoided the embarrassment of the failure of the entire mining area after the attack on the 1804 mining area. ”

"8 antimatter planets, enough to destroy all enemies, as long as they are made of positive matter." Pangu's words caused everyone to laugh, but he himself had a serious face: "So, this is a top secret, the third part of the construction of the Blue Domain Alliance does not know, the entire control room is located underground, and Kuibo and I will not disclose the specific location here." For the sake of secrecy, all those involved in the construction swore in advance that they would not leave the control room even after the construction was completed, but would continue to participate in the maintenance and calculation work. At that time, it will be handed over to Captain Dewey as top secret, and please keep it secret, and if someone asks, they will say that the control room is in Gaia, and nothing else will be mentioned. ”

Everyone knew the seriousness of the problem, and Ouyang Jiannan immediately organized everyone to take an oath when he saw this.

"Let's take a look inside the Starbelt and Nebula." Dewey's proposal ended Kuibo's three-dimensional simulation, and everyone flew off to the outer reaches of the galaxy with the Falcon.

Several large towers of comparable tonnage to the Origin were towed into orbit with the last four large celestial bodies, the main power was provided by the unidirectional release of energy from several tugs attached to the planets, and the secondary tugs attached to the surrounding areas controlled the direction and spiraled, and the gas and attachments on the surface of the star were mixed with the energy rays released by the tow ships, leaving a long tail behind the star, and a small amount of matter was captured by the huge gas planets in the system.

"Wait for the last four large celestial bodies to be moored in, and the construction of the Kuibo defense belt will be officially completed. The location of the two gravitational traps is kept secret. ”

"Show Captain Dewey the effect." Pangu reminded.

"Attention Control Room, Zone 1 is lit up."

"Roger, Professor."

In the dark space, tens of thousands of stars began to emit a faint light, from Gaia, the stars in the sky were more numerous, and the "moon" was hundreds more, slowly, the starlight began to become more and more intense, and the "moonlight" was no longer weak, the side of the planet facing away from the star began to be illuminated, the nocturnal animals panicked, the sleeping lion began to get up to greet the "rising sun", and the "on-duty" Meng Ge woke up all the sleeping kind, watching the abnormal sky.

Watching the bright band gradually complete, and the light shining on all corners of the galaxy, Dewey spoke: "Okay, don't waste energy. Let's go to Nebula again. ”

The long void gives the illusion of being far away from the galaxy, and the first comet flashes with a long tail, signaling that the destination is near.

"Leaders, you might as well enter the hibernation capsule, if you sail at this speed, it will take at least a year to look beyond the nebula."

The group followed the professor's advice and woke up light years away.

"Although the number of objects in the nebula is much larger than that of the star belt, the density of the two is comparable."

"What thrusters are used?" Bamulin is a tech nerd.

"This question is good, most of the comets in the nebula are ice-like, and the thermal propulsion is easy to melt and become unstable, and the thruster uses new technology to control the release of positive and negative energy of annihilation to the greatest extent, and then the cold air does the work to propulsion, without producing light and heat."

"Surprise the leaders with all the bells and whistles?"

"Console, Zone 2 blackout."

"Received Professor."

The Falcon shell plate was folded, the entire galaxy was taken into view, and the Kuiper Belt was lit up again, reflecting the light of the stars to form a large shiny disk that gave the entire galaxy a panoramic view. The dazzling light did not last long, and hundreds of small black dots were neatly lined up, horizontally and vertically to the center of the entire disc, and the neat array was completed.

"Scatter," Pangu whispered.

All the black dots began to scatter into countless small black dots, and the light of the disc slowly became blurred, and the number of black dots continued to increase, knowing that the light of the entire disc was obscured, and the night sky instantly became dark.

"Ying." Another whisper.

The black dots slowly write the words "Gaia is immortal, the blue domain will live forever" in the order of the strokes of the text.

"It's a waste of energy." Although this scene was fancy, Dewey was really distressed to watch.

"The captain ignored that we were now light-years away, so the disc brilliance was imaged during intensive debugging a few months ago. I tracked the location of the light propagation through the Falcon's computing system and ran to the front of the image. ”

"Well, now give me a telescope where I can see me a few months ago." The fourth child's words drew another burst of laughter.

"The scenery of the Great Wall is really shocking, but Kuibo's computing power is also second to none, and he can calculate the front of the light in such a short time, Old Five, you have time to learn from each other."

Kuibo just smiled, he just didn't want Gaia to follow in the footsteps of Mine 1804, if Camon dared to invade again, he must let them have no return, and one day, he would personally avenge his teacher, Professor Gilneth.