Explore the origin of space cities

The rapid growth of the earth's population leads to the rapid expansion of cities, the decrease of cultivated land and serious urban pollution. With the development of space technology, it is predicted that the establishment of a space city to live and work in space will become a reality in 2 1 century. At that time, you may be lucky enough to become a new citizen of Space City and live and work in the space world.

Human exploration of building a space city. For a long time, people have always had the idea of building a space city in space outside the earth. 1926, tsiolkovsky, the originator of human space technology, imagined that one day in the future, human beings would establish settlements in space around the earth. He imagined that the weightless environment in space could produce artificial gravity through rotation, and the indoor temperature and humidity could be suitable for plant growth through manual control, so that plants could be planted in greenhouses. He boldly predicted: "Choose the crops with the biggest harvest, and under the best growth conditions, every inch of land on the space farm may be enough to feed space immigrants."

Maybe you will ask, isn't the space city a space station? In fact, the space city envisioned by scientists is different from the space station. Their main difference is that the space city, as a space settlement, should be self-sufficient, first of all, self-sufficient in food. At present, the daily necessities on the space station are all transported from the ground.

In order to explore the possibility of planting in future space cities, the former Soviet Union has carried out long-term experiments on plant cultivation and grain cooperative production on Salute and Mir space stations for many years, from cultivating algae such as Chlorella to various flowers, vegetables and food crops, so that these plants have experienced the whole process from sowing to harvesting in space, and these experiments have made breakthrough progress. Hundreds of plants have been cultivated on the "Peace" space station. All kinds of plants have experienced the whole growth process from sowing, germination, flowering to seed setting, and wheat and other food crops have also been successfully planted on the space station.

199 1 year, the United States implemented the "Biosphere II" program. The plan is to create a quasi-space environment on the ground, send eight male and female researchers, mobilize about 3,800 species of animals and plants, and be enclosed together in a building made of glass and steel to form a closed ecosystem, simulating people's long-term self-sufficient life in space. But unfortunately, the experimental results are not as perfect as expected. The experiment ended in failure because there was no way to deal with the carbon dioxide in the building. Now the relevant departments in the United States have readjusted the experiment. After the United States, ambitious Japan is implementing the "Biosphere J" program to explore self-sufficient life in space.

In addition, because there is no space station in the United States, these experiments can only be carried out on the space shuttle, and the short flight time of the space shuttle greatly affects the development and effect of the experimental project. Therefore, the United States is planning to build a space botanical garden and a space farm. The botanical garden is about 4.2 meters in diameter and 3.7 meters in length. The automatic control system can provide the water, fertilizer, sunshine and temperature guarantee conditions needed by plants. Management, harvesting, processing and waste disposal are all handled by robots. If something goes wrong, the robot will report to the space station in time, and the astronauts on the space station will enter the botanical garden for maintenance.