The so-called space defense system, the full name of which is the 'Solar System Space Integrated Attack and Defense System', as the name suggests, is an all-round 'package' of the entire solar system.

Nearly six years is enough time for North to do a lot of things.

More than three years ago, the mothership was finally repaired, and at the same time, there were more than multiple star systems around the solar system, and the corresponding wormhole data was calculated by North. The mothership that can perform space jumps has been repaired, and the wormhole space location data is available, which means that a real space walk can be performed.

Three years ago.

The mothership is programmed to operate on its own, carrying a variety of equipment for exploration and mining, and travels to the constellation Centauri, the closest to the solar system, via wormhole jumping.

Unlike the solar system, this star system, which is only 4.2 light-years away from the solar system, is known as a triple star, which means that this star system is made up of three stars. This point has been known many years ago with the astronomical technology of the earth, but with the original technology of the earth, it is difficult to detect the planets that cannot emit light and are relatively small, so it is not known that there are as many as 19 planets in the constellation Centauri.

Of course, the reason why there are so many planets is largely due to the shape of the triple star, which provides a greater gravitational pull than the solar system.

As a result, the mothership began to exploit resources in Centauri according to the established procedures, and a virtuous circle began.

A large amount of metals, minerals, and energy are mined and sent to Mars.

Why is Mars to be?

Very simple!

There is no heavy industry on the earth now, and all industries with serious pollution have been gradually moved to Mars, which has no traces of life and is not suitable for human habitation.

This is also the reason why Qin Yan found that the impurities in the air were significantly reduced when he first came from the Space Bridge.

On the one hand, the polluting industry was migrated to Mars by North, and on the other hand, he used powerful high technology to comprehensively optimize and transform the earth's environment. Of course, it is not enough to rely on his transformation, the Earth Federation has implemented the prevention and control of pollution as a federal law, and any collective or individual who causes pollution to the environment will be severely punished by the federal law.

Since then, since the beginning of the Industrial Revolution, the problem of pollution, which has been getting worse and worse on the earth, has been fundamentally solved.

In addition, a large number of resources were sent to Mars, a series of production lines began to operate, and more transport ships were built to join the sequence of developing resources.

It's a virtuous cycle: with the resources, you can build transports and all kinds of equipment, and with these things, you can extract resources faster and more.

It took North two years to build a sizable transport fleet.

After that, the resource reserves reached a certain level, and he began to spend a certain percentage of his resources on building high-tech weapons.

Battleship.

Mecha.

Fighter.

Satellite.

A wide variety of weapons are produced, some offensive, some defensive, and some responsible for mass surveillance.

With a large amount of technology in hand, with massive resources, the military power from Alpha Star has been perfectly replicated on Earth.

Today, far away in the outer regions of the solar system, there are thousands of satellites monitoring at all times, and the performance of these satellites is hundreds or thousands of times more powerful than the previous military satellites of the earth. They can monitor the Earth in incredible detail within a range of light-years, whether it is a natural disaster such as a comet hitting the Earth, or a man-made disaster such as an alien invasion of the Earth, they can detect and respond to it long in advance.

Combined with a surveillance system covering several light-years of the perimeter, of course, it requires equally powerful force.

In total, North has three attack and defense systems in the solar system.

The first layer is the most powerful, that is, the orbit of Pluto, which is at the edge of the solar system, and the First Fleet of the Earth Federation is stationed all year round.

This fleet is concentrated, seventy percent of the air power mastered by North, the fleet is distributed near the orbit of Pluto, connected to each other through high-performance satellites, and finally controlled by North as a whole, once it encounters an invader, it will be concentrated in a short period of time through sub-light speed flight, and carry out a devastating blow to the enemy, as far as possible to keep the outside world out of the solar system, rather than using the solar system as a battlefield.

Due to the vastness of Pluto's orbit, the first line of defense is a purely space line of defense, dominated by warships, warplanes, and mechs.

The second line of defense is in orbit around Mars.

This line of defense accounts for the remaining thirty percent of the air power, and when the enemy is too strong to break through the first line of defense, the second line of defense will serve two purposes: first, to delay the evacuation of human beings on Earth; The second is to protect the safe evacuation of various industrial production lines on Mars.

Unlike the first line of defense, in addition to the remaining 30% of the air force, there is also a large amount of ground power to protect the industrial equipment on Mars.

The sheer size of the planet doomed the superiority of land-based weapons.

For example, some weapons that release great energy, if installed on a battleship, have a terrible recoil that the battleship cannot withstand at all. However, if the entire planet is used as a base to cushion its strong recoil, it can be installed and erected.

The third line of defense - Earth!

This is the last of the three lines of defense, and it is also the home that human beings rely on for survival.

In the first two lines of defense, which occupy 70 percent and 30 percent of the air power respectively, the air strike power on the earth is negligible.

In addition to the transport ships that have been distributed throughout the world for a long time and are used to migrate in the face of irreversible crises, there are only two large warships, as well as a small number of warplanes and mechas.

But!

As the most important third line of defense, the earth has the most powerful land-based forces.

More than half a year ago.

As more wormhole data was deduced, the scope of resource extraction expanded from the constellation Centauri to star systems such as Barnard and Woolf 359, which were only slightly farther away from the constellation Centauri, and finally found a metal that did not exist on Earth but had an extremely important role.

The scarcity of this metal is extremely precious, but only this precious metal can make planetary-class railguns with incredible power.

So far, only three planetary-class railguns have been manufactured, and all of them are installed on Earth, which can be called the ultimate weapon on Alpha Star.

According to North's stated power, the planetary-class railgun can completely wipe out the Earth with a single blow if it is fully charged.

Even if it is a large planet of the Jupiter level, it cannot withstand three or five attacks from a planetary-level railgun.

The above is what North has gained in the past six years, which is what he called the space defense system!

After listening to North's explanation, Qin Yan was already dumbfounded.

He had long guessed that the mothership had been repaired, and it was likely that he already had the ability to travel to neighboring star systems, but he didn't expect that North had developed and completed the entire process of interstellar development and military and civilian technology manufacturing, let alone that he would build a fleet and arm the solar system.

"But our foundation is too thin, everything is starting from scratch, and armaments and weapons of this scale are only a small detachment in interstellar warfare." Probably thinking of the previous time, as the intelligent brain of the central mothership, the super fleet controlled under his command was slightly compared with the current situation, and North's tone was a little gloomy.

In fact, there is no comparison between this at all, you must know that civilizations of the level of the Alpha Star People have been developed over millions of years, and how profound is the heritage?

North was able to use the current virtuous cycle of development and manufacturing to build such a powerful armament in a short period of time.

What about the Alphas?

They can do the same, but in comparison, their cycle of conscience has lasted for millions of years, and the stellar coefficients they have developed are in millions, and the amount of their armament is conceivable, and in North's words, Alpha Star has not actually attacked the Earth in full force at all.

Because they also need more strength to conquer a large area of the starry sky and garrison the base camp, Earth is only one of their many goals.

How could they travel long distances, send hundreds of millions of fleets, and expend a lot of energy to conquer this place?

But!

If the earth has the absolute upper hand in the war, then the Alpha Star will really pay attention to this opponent and will send a stronger force.

Obviously, defeating the demons is far more difficult than you think.

According to Enos, the combat power invested by the Alpha Star on the side of the Earth is probably less than one ten-thousandth, and the Earth has been defeated one by one: if the current strength of the Earth slightly exceeds the amount of force sent by the Alpha Star, it is not a bad thing but may be a disaster.

Because that will make the other party pay attention to the earth, and will send more and stronger fleets, will the earth still have the ability to support it at that time?

"Qin Yan, what are you sending it?" North glanced at Qin Yan.

"The news ......"

Qin Yan swallowed his saliva and turned his head to look at North: "Why didn't you tell me earlier?" ”

"Does that need to be said? I thought that with your not bad IQ, you should have known the Tao a long time ago. ”

North said with a look of course on his face: "Alpha Star is a sixth-level civilization, as long as it reaches the third-level civilization, it can carry out preliminary space exploration. Do you know how many years it took for the Dao Alpha Star to go from a third-level civilization to a sixth-level civilization? Over the years, they have conquered many star systems, obtained astronomical resources, and built more fleets than ordinary people can imagine. What about the Earth? Stuck in such a small solar system, you wouldn't be stupid enough to think that the force of Alpha Star to Earth is all they have, right? If the Alpha Star pours out of the nest, the Earth's strength will be ...... If the number of warriors increases by a hundredfold, it will not be enough for them to fill their teeth! ”

How many people are there on Earth?

The Alpha people are not just from one planet, countless years ago they were just like the current Earth humans, just stuck to one planet, but with the development of technology, they have the ability to colonize the stars, they will find more and more habitable planets, their descendants are scattered on countless planets, and their population is likely to be in trillions, just like their expanding fleet.

Astronomical!

The beginning of the era of interstellar colonization means more habitable planets and more resources, and the population will not be limited like Earth.

All in all, the news that North inadvertently mentioned was very unexpected for Qin Yan, but it was reasonable, the key was to make the battle of gods and demons far more difficult than imagined......