Time flies. In the twinkling of an eye, three years have passed. In these three years, the whole human civilization has developed very rapidly. At the same time, the development of major space agencies, including the official, is not slow.


    Even the ground defense facilities under construction by human civilization have begun to take shape at this time. At this time, there have been more than ten space stations in the earth''s low earth orbit. These space stations vary in size, up to thousands of tons, such as the official space station, while small space stations are only dozens of tons or even smaller.


    However, these space stations have a common feature, that is, these space stations have military functions, and these military facilities are different from previous space military facilities. In the past, the muzzle of everyone''s space military facilities was aimed at the earth, that is, inward, but now, these military facilities, Its muzzle is aimed at the boundless universe.


    Obviously, these military facilities exist for the purpose of responding to threats from other civilizations in the universe.


    As for the medium orbit space station, there are already three at this time, that is, Ziwei space station built by Tiangong technology, Xinghuo space station jointly built by Tiangong technology and Huaxia, and finally Adam space station jointly built by Tiangong technology, Huaxia official, X aerospace company of bald eagle and Arctic.


    Of course, among the three space stations, Ziwei space station has the largest volume and weight. Due to the adjustment of the drawings, the tonnage of their Tiangong technology space station was about 1000 tons at the time of design, but due to various reasons, the total weight of the improved space station reached more than 1500 tons, And in this short period of less than three years, their Tiangong technology, relying on their own strength, built this space station alone, which also shocked the rest of the world.


    However, they are also very glad that when signing the agreement, it has been stipulated that the voice of Tiangong technology and the official will remain unchanged in the next 30 years. Otherwise, if Tiangong technology participates in it, it can occupy more than 50% of the voice of the whole defense circle only with the completion of the space station of Tiangong technology.


    In addition, there is the spark space station jointly built by Tiangong technology and the government. Although this space station is jointly prepared by Tiangong technology and the government, and its final target tonnage and volume will exceed Tiangong technology''s Ziwei space station and reach the 5000 ton space station, so far, The space station has just reached 300 tons. According to Wang Bin''s prediction, it will take at least five to ten years to complete the space station.


    In addition, to build the space station, it also requires a lot of investment in money, time and technical manpower. Don''t think about it in a short time. After all, it''s not just Tiangong technology that lacks a large number of technical talents, even the official and other space agencies in the world.


    For this reason, over the past three years, the world''s major space agencies have launched a large-scale action to dig people. As long as they are aerospace related talents, these space agencies will never let go. Even in order to dig people, everyone has opened up various benefits, so that most of these Aerospace talents in society have gone to major space agencies, It is difficult for others to find such talents.


    In addition, the world''s major universities have also expanded the enrollment rate of aerospace majors in an efficient and large-scale way. For example, in China, the enrollment expansion of aerospace majors has reached 300%. However, even so, talents are still far from enough.


    Of course, the world''s major space agencies are doing their best to train astronauts.


    After all, this is about the voice and interests of these space agencies in the whole Earth Defense circle and even the whole solar system in the future! Once you fall behind, it''s definitely harder to get it back in the future than going to heaven.


    The last medium orbit space station is the Adam space station.


    Although the space station is jointly built by many parties, the size of the space station is the smallest of the three space stations, and its design tonnage is only a mere 1000 tons.


    However, different from the other two space stations, the other two medium orbit space stations, including Ziwei and Xinghuo, are dual-use space stations. The role of this space station is a purely military space station and is not open to the public. Therefore, the scientific and technological content of this space station is actually the highest.


    Similarly, since the space station is a purely military space station, the construction of the space station is also the most difficult.


    Although the space station has been built for more than two years since its construction, its current total weight is only about 500 tons. According to the plan, it will take more than two years to complete.


    Then came the high orbit space station, which banned the construction of the orbital space station and the lunar base.


    Compared with the middle orbit, there are three space stations. Up to now, there is only one space station in the high orbit. Because the construction of this space station has just begun, its size and weight are still very small, about less than 200 tons.


    You know, this space station is also a space station jointly built by major space agencies in the world, and it is also a super large space station. According to the construction plan and drawing planning, after the completion of this space station, its total weight will be as high as tens of thousands of tons.


    In addition, this space station will also be the first space station with a certain artificial gravity in the whole human civilization.


    Of course, with the current scientific and technological level of human civilization, no real artificial gravity technology has been developed, and the space station naturally can not use artificial gravity technology. The reason is that the space station will have a certain gravity. This is the space station, which will be the first space station of human civilization to adopt rotating gravity, so there will be a certain gravity.


    After all, the space station is in the forbidden orbit of the earth, and its volume and weight are far more than the most in the history of human civilization, so it is natural to use the most advanced technology of human civilization.


    However, even the simplest rotating gravity technology has great difficulties for today''s human civilization. Therefore, Wang Bin is also looking for the corresponding technology in the science and technology mall.


    The last is the construction of the lunar base. Compared with the rapid construction of various space stations in earth orbit, the construction of the lunar base is not fast. Up to now, the lunar base can only barely provide the survival, life and scientific research of 20 or 30 people. It is far from what Wang Bin and his colleagues imagined that it can provide more than 100000 or even millions of people to live and produce together, And the idea of developing lunar resources is still very far away, which will take at least more than ten years.