How to build a habitable planet from scratch

The idea of building a habitable planet has always been a topic of discussion among science fiction writers. The question is, can we do it? If we can, what should we do? According to the news on December 14, Beijing time, the construction of a space station similar to a planet or the complete reproduction of a planet is far beyond the current level of human science and technology. None of us is likely to witness such a feat, at least in our lifetime. However, it is a more feasible choice to make the existing planets more earth like. < / P > < p > nowadays, it seems that everyone wants to go into space, and some even want to build a country in space. On the other hand, the world is facing many global threats, such as climate change, overpopulation and potential epidemics. To deal with these threats, it’s always good to have a backup plan. One obvious plan is to go into space and establish human colonies far away from the earth. < / P > < p > in science fiction, we often see people living on objects the size of planets. From the legendary death star, to the planet building facilities in China, the idea of building a habitable planet has always been the topic of science fiction writers. The question is, can we do it? If we can, what should we do? < / P > < p > if we want to build a habitable planet, we must first find a suitable place in space. Most importantly, the planet needs to be in a habitable zone. This means that the orbit of the artificial planet, or its distance from the nearest star, should be able to ensure that the temperature is conducive to the development of life. If the planet is too close to the star, we’ll be scorched by the heat of the star, and if it’s too far away, we’ll freeze at a very low temperature. In addition, there must be a lot of liquid water on the planet, because there is no life without water. < / P > < p > in addition to the appropriate temperature and distance from the star, we also need an atmosphere containing respirable gas, a stable gravity similar to the earth, and an appropriate circadian cycle. Only by meeting these prerequisites can we consider building a livable planet from scratch. < / P > < p > now, there are two ways to build so-called “man-made livable planets.”. First, we can make a planetary replica, including a large piece of rock made into a giant sphere, which is almost the same as other planets in the solar system. Another solution is to build a huge satellite in space, perhaps more precisely, a spherical space station, just like the death star in space. The second is not really a planet. Although it is spherical, the artificial planet will not orbit the sun in a fixed orbit, but may just circle the earth like other artificial satellites. < / P > < p > for engineers and scientists, both schemes are extremely difficult, but the second scheme is relatively more feasible. Next, let’s start with this plan. < / P > < p > as mentioned earlier, it is much easier to build a planetary like spherical space station than a giant earth like planet. As you can see, the diameter of the death star is about 120 kilometers, which is very huge! You know, the largest space station ever built is less than 160 meters long. Of course, when you compare the death star with the earth, which is 12756 kilometers in diameter, it is insignificant. However, for the sake of simplicity, we still set 120 km here. < / P > < p > if we build this planet like new space station like an aircraft carrier, and mainly use steel as building materials, we will need about 1000 trillion tons of steel. With our current technology, it will take more than 800000 years to produce so much steel! At present, mankind can only produce about 1.8 billion tons of steel every year. < / P > < p > to obtain the raw materials for the construction of such a planetary space station, the only alternative is to obtain them from space, rather than relying on the resources of the earth. To do this, we may need to mine asteroids, or even the moon. In fact, many companies are studying this concept, and some related research is also in progress. < / P > < p > now, assuming that we overcome the logistical challenge of purchasing raw materials to some extent, then we need to build a habitable spherical object with advanced robots. The reason why we need to build a space station similar to a planet is that we can obtain the gravity similar to the earth. In weightlessness, our physical condition may become very bad. Astronauts working on the international space station for a long time often have to deal with bone loss, hypotension and other health problems caused by microgravity. < / P > < p > it sounds cool to build a planetary like spherical space station like a death star, but it may have inherent defects: lack of stability. In order to maintain its stable operation, we need to carry out a lot of active maintenance. To achieve this feat, human beings need to be at least the so-called type I civilization in the kardashov index. According to some scientists, it will be centuries before we reach this level. < / P > < p > according to hempsell, there is no need to build a replica of the earth completely and accurately. In other words, we can build smaller replica planets. He estimated that to reach the earth’s gravity level on a man-made planet, engineers could compress one tenth of the earth’s mass into a sphere nearly the size of the moon. The mass of the earth is about 5842 trillion tons, while the diameter of the moon is 3476 kilometers. Of course, it still needs a lot of rock, but hempsell’s suggestion is that we can imitate the way nature creates planets. < / P > < p > rocky planets like earth are formed by the accumulation of residual material released at the birth of the sun. Over millions of years, these particles gather little by little, piece by piece, until they form a habitable planet. According to hempsell, we can try to imitate nature’s process of forming planets, but we need to speed it up. < p > < p > hempsell believes that in order to speed up, we can build an advanced nuclear fusion facility near the sun, where we can obtain the heavier materials needed to build new earth like planets. He pointed out that elements with higher density, such as osmium, iridium and platinum, would be a good choice for building replication planets. These heavier elements can be stacked together and then cooled naturally. < / P > < p > however, hempsel admitted that the only way known to human beings to obtain these elements is the thermonuclear explosion of supernovae. Perhaps only when we reach the type II civilization of the kardashov index can we build a nuclear fusion facility with such a large amount of energy. However, it can take thousands of years to build a planet. < / P > < p > in addition to the above two whimsical ideas, there is a more feasible option – to make the planet or satellite suitable for human habitation through earthization. < / P > < p > in the transformation of the earth, we don’t have to build planets from scratch. What we have to do is to transform the existing planets to make their environment suitable for life. For example, we can have a nuclear explosion on Mars to warm its atmosphere to the degree we need. Then, we need to find a technology that can preserve the Martian atmosphere and make it as warm as the earth. Many researchers believe that this idea may become a reality within decades. < / P > < p > finally, from the perspective of science fiction, it’s quite interesting to build planets from scratch, but in fact, the realization of this idea is far away from us now. In the next few decades, we may be able to make Mars or the moon more like the earth, which is an incredible feat for human beings. Fifth personality will be updated, please remember your game account, otherwise you may not be able to play normally