Sailing in the cosmic void is very boring, especially in the regions outside the distant star systems, which are very empty, and many stars seem to be close at hand, but in fact the distance of these star systems is calculated in light years.

In the long-term interstellar voyage, the psychological problem of astronauts is a very important topic, and the alliance has even set up an institution such as the Institute of Cosmic Psychology to study the mental illness that astronauts are prone to during astronauts.

On the space cruiser Explorer, political commissar Zhang Handong has another important duty in addition to supervising the discipline of the captain and soldiers: psychological counseling.

In order to alleviate the psychological problems of astronauts, the battleship is not only equipped with living facilities, but also with entertainment facilities.

Zhang Handong is playing space football with a few soldiers, space football is completely different from Blue Star ground football, due to the microgravity environment of space, space football gameplay is very ghostly, they use their strengthened bodies, crazy collisions in the stadium, and even martial arts techniques.

"Damn, Commissioner Zhang, you are playing Laipi."

"Soldiers don't get tired of deceit."

Zhang Handong kicked away a guy who was trying to grab a rugby ball and jumped towards the opponent's goal, but the opposing team's players were not vegetarians, and the two blue team players outflanked him left and right.

"John, go on."

Zhang Handong threw the ball at another red team player with a feint, and the two blue team players who outflanked him from left and right collided with Zhang Handong in an instant.

At this time, outside the stadium, there are constantly cheering and shouting spectators and blue sky and white clouds, obviously this is a holographic simulation environment, only the players in the lounge on the side are real people.

However, the two teams that are playing fiercely on the field are as if they are really in a space football game in the solar system.

Ma Wu, who had just come off his shift, also came to the outside of the venue, looking at Zhang Handong and others who were rolling and moving in the venue, he shook his head with a smile, he sat on the chair next to him, opened the holographic bracelet and looked at the news.

Thankfully, the Explorer's quantum communication system is now delay-free, and he can read the Alliance's internal news at any time.

[Mars Daily: Mars welcomes all citizens of the alliance to come and settle down and buy real estate, each person can get 100 square meters of housing for free, and arrange work and annual income of 100 million yuan within tax exemption for 5 years...... ］

[War & Peace Weekly: The Coalition welcomes citizens to join the army to defend the solar system and march into the galaxy...... ］

[Oceania United Daily News: Madagascar has applied to the Council of the Alliance to become the first Nature Conservation State, which has approved that the Natural State of Madagascar will be officially included in the management of the Alliance as of April 12, 2nd year...... ］

"What are you looking at?" Zhang Handong wiped his sweat with a towel as he spoke.

"No, just check out the news from the league." Ma Wu continued to flip through the news.

After Zhang Handong sat down and took a sip of the nutrient solution, he looked at the time of his watch [12:21 on April 4, 2nd year, galaxy].

"Is it Hai Bo who is commanding the battleship now?"

"Yes."

"Did you find anything out of the ordinary?"

"Anomalous? Does Commissioner Zhang mean aliens or is it?" Ma Wu raised his head and asked with a smile.

"Both." Zhang Handong put down the towel and water bottle, opened the holographic bracelet and prepared to record something.

"Everything is normal, but 11 asteroids with a diameter of more than 50 meters have been found near the channel, and the star map database has been updated, and nothing else has been found." Ma Wu thought for a moment and replied.

Zhang Handong recorded these materials while looking at the database, he had the habit of writing a diary, and soon he recorded a full page.

"Huh? Gravitational waves?"

"It should be that the Void Test Site has recently tested the gravitational bomb, and we are now about 370 astronomical units away from the Helic Planetary Fortress, and we are also 346 astronomical units away from the Void Test Site, so it is normal to receive gravitational waves." Ma Wu explained.

Zhang Handong raised his eyebrows and continued to write in his diary.

"What is the fuel and supply stock of our spacecraft?"

"Everything is normal, if I reach the first cordon, I will look for some planets to resupply." Ma Wu replied.

……

With the passage of time, the gravitational bomb has been tested six times, and after so many tests, the Gravitational Research Institute has obtained a lot of data, and through further analysis and research of these data, An Shitong and Wang Wenhua and others have made unprecedented progress in the study of gravity.

For example, they have successfully analyzed the principle of gravitational enhancement and weakening, and also discovered the phenomenon of superluminal speed under strong gravitational force and the phenomenon of low speed of light under weak gravitational force.

These circumstances illustrate that the speed of light in the universe is not necessarily constant, especially when the gravitational intensity in the early universe was higher than in modern times, when the speed of light should have been higher than 300,000 kilometers per second, and if the universe continues to expand in the future, the speed of light may slowly decrease.

For these theories, Huang Haojie is also more or less studied, for the universe has a beginning and an end, Huang Haojie's view of the universe is [the beginning (singularity) - the Big Bang - red shift (expansion) - the middle point (equilibrium point) - blue shift (contraction) - heat death collapse - end point (beginning)], this process is cyclical.

Of course, whether it is red shift or blue shift now, human civilization has not yet reached the point where it is necessary to think about the destruction of the universe, after all, even if the universe is to be destroyed, it will be hundreds of millions of years later, and it is better to take care of the things in the galaxy in front of us.

The Gravitational Research Institute has finalized and mass-produced gravitational bombs of the order of 1 astronomical unit, gravitational bomb of the order of 5 astronomical units, and gravitational bombs of the order of 25 astronomical units, and is currently developing 100 astronomical units and 500 astronomical units.

Gravitational bombs of the order of 100 AU and 25 AU were transformed into space mines, and then hidden inside asteroids, and the coalition forces planned to lay a layer of space minefields in an area about 1000~1500 AU from the sun.

Then use gravitational bombs of the order of 25 astronomical units and 5 astronomical units to arrange the second layer of space minefields within a range of about 500~600 astronomical units from the sun.

The gravitational bombs or gravitational missiles equipped on the battleship are on the order of 5 astronomical units and 1 astronomical unit.

Of course, since it is necessary to lay mines, then the early warning system must also have the ability to detect the other side in advance, and the Supreme Command decided to deploy the first layer of early warning satellites in an area about 1500~1600 astronomical units away from the sun; In an area of 600~700 astronomical units, the second layer of early warning satellites is arranged; The early warning satellites near the Oort cloud were the third layer of early warning satellite systems.

Minefields and early warning systems intersect in the outer layers of the solar system, forming the first line of defense in the solar system, unless the opponent is constantly using large-scale legions to explore the way to mine, otherwise it will be difficult to rush into the Oort cloud border of the solar system, even if it can rush in, it is a small fleet.

As long as the alien civilization is not a third-level or fourth-level civilization, and the human civilization is in the second-level civilization, it is unlikely to lose, even if it is defeated, it is a big deal to escape in the civilization seed spaceship, and now the first civilization seed spaceship "Blue Planet" has been completed, and the "Shenzhou Chixian" is under construction.

In other words, human civilization can temporarily free its hands and feet to carry out the work of cosmic exploration.

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