On February 17, 2223, the day after Ji Xiaotong and Yi Qi reported for duty, Xinyuan left the solar system.

The run-in between teams is not something that can be completed in a day or two, the two of them must be familiar with Ye Fei's command style, but also familiar with the various habits of their teammates, and the best way to run in is to perform various tasks and gradually cultivate a tacit understanding between teammates.

Therefore, Ye Fei assigned the patrol and repair task of the fleet to the Xinyuan to run in the team.

Although the group army is named after the solar system, and the vast majority of the warships in the fleet have always stayed in the base of the solar system, it does not mean that the warships of the group army only operate in the egg-sized shell of the solar system, in fact, the farthest control range of the group army is about 50 light years.

The farthest control range is also called the early warning range, which is essentially the farthest defense depth of the solar system group army, but all the stars within this range are near the solar system group army, there are early warning satellites placed by the solar system group army, once the direction of the unknown source fleet or a large group of cosmic creatures flying to the solar system, the satellite will immediately send an alarm to the group army base and remind the fleet to respond in time.

The effective control range of the second level is about 30 lights, that is, the farthest volley distance after the fleet takes the initiative to attack.

Finally, there is the core control area with a radius of five light years, which means that the fleet can reach any coordinates in this range in a relatively short time and quickly enter the battle.

In order to strengthen the control of the core area, the fleet has placed an astronomical number of early warning satellites within a range of five light years centered on the solar system, forming a huge network of early warning satellites to ensure that any faster-than-light vehicle enters this range. The resulting spatial fluctuations will be detected within an hour by the scattered early warning satellites.

As for the solar system itself, needless to say, if the peripheral warning, mid-term volley, and core confrontation fail to resist the enemy's surprise attack, then it is meaningless to defend the solar system.

This level of defense was established after the solar system was attacked by the Shang people, in order to reduce as much as possible, or even prevent the solar system from being affected by war.

The interstellar war between the two civilizations can only be described as the collapse of the sky and the earth, and the planets that mankind has destroyed with their own hands in foreign wars are unknown, but the earth was exposed to the Atlanteans tens of thousands of years ago, so that it is impossible to hide the location of the solar system.

The subhumans have no intention of helping humans keep secrets at all, and I don't know how many extraterrestrial civilizations are eyeing the solar system at the moment.

The defense of the solar system, the earth, is the cradle of mankind and has a special place in the hearts of all earthlings. Even if it's to take care of the feelings of the people. The military will never give up the solar system lightly.

As the saying goes, if you are not afraid of thieves stealing, you are afraid of thieves, and merely huddled in the solar system waiting for the enemy to attack the door does not conform to the military's overall strategy of taking offense as defense and active defense, nor does it meet the actual needs of the fleet's defensive operations.

With a greater strategic depth, we will block the invading enemy layer by layer. in order to maximize the guarantee of the solar system. Especially the security of the planet.

Actually, everyone knows it. It is extremely unlikely that the invading technological civilization fleet will stop in a galaxy on the way, and the most likely is to fly directly to the solar system, so that all the early warning satellites along the way will not get any news.

Early warning satellites on the periphery. At most, it is a warning of cosmic creatures, and the only thing that can really play an early warning role is the core control area of five light years.

In addition to the solar system, the blue light star, the base star and the Yunzhou star have also carried out the deployment of early warning satellites within the range of 50 light years, but this work has not been carried out for a long time, and the satellite arrangement of the core control area will be completed at present.

The mission of Xinyuan is to deploy early warning satellites in the direction of the Gemini constellation.

It took only one day for the battleship to reach the North River 33.7 light-years from the solar system.

The battleship broke away from the speed of light near Beihesan, and Xia Zhuoyan quickly aimed the lens of the optical system at Beihesan.

The North River Three is the β star in Gemini, which also represents the star in the head of the younger brother on the left side of the twins.

Ji Xiaotong stared at the stars on the screen like a curious baby and said, "This is Beihe San? Didn't it say it was the seventeenth brightest star of the day? Why doesn't it look like the sun is shining yet? After speaking, he turned his inquiring gaze to Yi Qi.

The people who can drive warships are half-astronomers, and this kind of question is right for her.

However, Yi Qi just glanced at him indifferently and refused to say a word.

Although there is a reason for the incident, but he heard so much privacy yesterday, and Yi Qi is still embarrassed in his heart now, how can he give him a good look?

Ji Xiaotong hurriedly turned his inquiring gaze to the others in order to hide his embarrassment.

The undercurrent surge between the two newcomers made Ruan Peng and Xia Zhuoyan look at each other and smile, Xia Zhuoyan took the initiative to help Ji Xiaotong solve the siege and said: "Beihe San is a red giant, and the surface temperature is much lower than the sun, but the diameter of Beihe San is more than 11 million kilometers, which is more than eight times that of the sun. It's a pity that we can't move the sun over and put it next to Beihesan, otherwise it will be more intuitive. ”

Yi Qi glanced at Xia Zhuoyan, who was not familiar with her, with a little surprise, she didn't expect her to be so familiar with Beihesan, but she only thought that Xia Zhuoyan was interested in Beihesan to know so much.

"I see." Ji Xiaotong looked like he suddenly realized, "Beihe San is a red giant, it is so close to the solar system, what if it explodes one day?" ”

Ji Xiaotong is actually not a particularly talkative person, but a newcomer needs to communicate a lot to integrate into the new collective.

"It's not a big problem." Ye Fei suddenly said, "Beihe San is a young red giant star, it has not had a record of helium flash so far, and its mass is less than twice that of the sun, and it cannot reach the eight times the mass limit required for supernova explosions, so the possibility of an accidental explosion is very low, and the possibility of directly becoming a white dwarf is relatively large." ”

After being appointed as the commander of the Solar System Group Army, Ye Fei began to care about the situation of the stars near the solar system, and he would definitely not be able to say this a few years earlier.

"I see, I thought red giants could become supernovas." Ji Xiaotong looked shy.

"It doesn't matter, everyone knows that the commandos don't teach astronomy, only geography." Ye Fei said with a smile, "You have also seen that there are only a few of us on the Xinyuan, and it is unlikely that we will replenish the manpower in a short time, although you are a fire control officer, it is best to know more about astronomy, the more knowledge you have, the more positions you can adapt to, maybe you will use it one day." ”

"Yes, I remember." Ji Xiaotong solemnly agreed. (To be continued......)