The cylindrical space city rotates once every minute with the central axis as the rotation axis, and gravity is generated through rotation.
This future space city is a cylindrical city with a length of 32 kilometers and a diameter of 6.4 kilometers. The living area inside is 1.3 million square kilometers, which can accommodate 1.0 million people. It takes six or seven hours to walk from one end of the city to the other. It is completely closed and its living environment is exactly the same as that of the earth. The gravity of the space city is the same as that of the earth, otherwise people and things living there will float in the air because of weightlessness, and there is no place to go up and down.
How can we generate gravity? Spin. This cylindrical space city rotates once a minute with the central axis as the rotation axis, causing a centrifugal force on the inner wall of the cylinder, which is exactly equal to the gravity on the earth's surface. The inner wall of the cylinder is exactly the ground of the city. Therefore, people living in the space city, standing on this land, feel the same as standing on the ground of the earth In the space city, no matter where you stand, your head is right on the central axis of this cylinder.
The space city is divided into three residential areas and three skylight areas, which will make the space city clear day and night.
In order to make the big cylinder have enough sunshine, scientists imagine dividing the wall of the big cylinder into six areas: three residential areas and three skylight areas. Residential areas and skylight areas are staggered, and one residential area is opposite to one skylight area.
The skylight area is made of huge glass, and three huge plane mirrors are installed outside the skylight area. The mirror is controlled by a computer and rotates according to a certain rule, reflecting the sunlight shining on it to the space city at different angles. The mirror rotates with the big cylinder. By adjusting the reflection angle of the mirror and the color of the skylight glass, the residents of Space City can not only see the blue "sky", but also watch the sunrise and sunset.
The space city has beautiful scenery, no noise and no exhaust gas, and cars are driving on dust-free roads. The living environment is better than the earth.
100000 people living in a vat will feel crowded? Of course not. Because 1300 square kilometers of living area is equivalent to half of Switzerland. Space City is divided into administrative area, residential area, cultural area and commercial area, and the largest is tourist area. There are winding green hills and gurgling green water in the tourist area; Flowers and plants are everywhere, and fruit trees are forests. No noise, no exhaust gas running on the road, no dust. The environment is much stronger than the earth!
Can you imagine? There are white clouds in the sky, white sails on the river, birds singing in the Woods, deer and rabbits playing on the grassland. In addition, there is a special sight here-people can see the "ground" overhead through the clouds in the sky, where the peaks, trees, houses and pedestrians are upside down.
Space City has large supermarkets, theaters, cinemas, concert halls, hospitals, libraries, gyms and nightclubs. In a word, space residents can enjoy everything that earth residents can enjoy, but there are no "man-made disasters" that today's society suffers, such as crowded houses, air pollution, traffic jams, lack of water resources and violent incidents.
The whole space city is a huge closed ecological circulation system, which can solve the problem of circulating supply of air and water. Radiation protection can be solved by the metal structure shell of the living room.
Like the earth, Space City is a self-enclosed ecosystem, and its daily necessities are completely self-sufficient.
In Space City, people grow their own food and vegetables, raise livestock, set up factories, and recycle air and wastewater. Space city, like the earth, is a self-enclosed ecosystem, and the only reliance is the sun.
There are many factories in the space city, including heavy industry, light industry and high-tech industrial zone. Heavy industry includes steel, cement, glass, rocket fuel and various chemicals. Industrial raw materials can come from the moon and some asteroids. If minerals shipped from the moon and asteroids are smelted, steel, cement, rocket fuel and chemical products can be produced. Light industry includes textiles, food and various household appliances. High-tech industries are mainly precision instruments, information technology and communication equipment.
Because the waste water and waste gas discharged by the factory will pollute the environment, the factory is located at both ends of the cylinder, far away from the living area and isolated from the living area. The central axis of the cylinder has no centrifugal force and is a weightless area. The factories here can just use the special conditions of weightlessness to produce things that cannot be produced on earth. For example, smelting refractory metals, refining very pure large crystals, processing round steel balls, making foam steel light enough to float on the water, metal wires thin enough to be seen with a magnifying glass, and transparent metal films.
The top of the cylinder also has a large circle of teacup-like structure. What is that? That is an automated farm. The crops planted here can be harvested four or five times a year, and the output is several times higher than that of the earth; Livestock and poultry may also grow bigger than the earth because of weightlessness. The farm has fruits and vegetables all year round, and there are often fish and shrimp. Fresh vegetables, fruits, chickens, ducks, fish, meat, eggs and milk are also provided. Self-sufficiency in agricultural products is no problem.
Experts estimate that in order to solve the problem of feeding100000 people, the agricultural area only needs 400 square kilometers of effective cultivated land, which is equivalent to 40 square meters of cultivated land per capita. In order to greatly increase the output of crops, we must vigorously develop new space agricultural technologies.
The Space City also has well-equipped scientific stations and observatories. From here, we can see the whole picture of the earth and comprehensively study the problems of agriculture, geology, astronomy, meteorology, soil, earthquake and environmental pollution on the earth. There are no clouds, rain, snow and atmosphere in space, and the light and radio waves emitted by the sun and stars will not be absorbed and reflected, making it the best place for astronomical observation and research. There is also a space dock at the top of the cylinder, which can dock spacecraft from the earth or other space cities.
Before building a space city, we should first develop the moon and use the resources on the moon to build a space city.
How was such a good space city built? It's hard. At least several million tons of building materials. It is better not to transport so many materials from the earth, but it is more cost-effective to take local materials from the moon or asteroids near the earth.
After analyzing the moon rock samples, scientists found that the moon rock is rich in elements such as aluminum, iron, titanium, silicon and oxygen. 95% of the building materials of Space City can be found on the moon. The gravity of the moon is much smaller than that of the earth. An object should leave the earth at a speed of11200m/s, while it only takes 2,400m/s to leave the moon. Sending the same weight into space can save 95% energy from the moon than from the earth.
Before building a space city, we should first develop the moon and use the resources on the moon to build a space city. Scientists estimate that as long as 150 people are sent to the moon, more than10 million tons of ore can be mined every year. Ore is thrown into a space smelting furnace by a magnetic launcher, heated, smelted and processed into various building materials and components such as aluminum and glass by solar energy, and then a group of migrant workers, mainly space robots, are put into orbit for unparalleled aerial work and assembly to build a space city.