Shulou(Shulou.com)11/24 Report--

Usually we usually talk about popular science, and even when it comes to science fiction, we focus on specific scientific details. Today, let's relax and talk about some of the settings behind science fiction stories. For example, many science fiction stories have a disaster background, which may be a series of volcanic earthquakes, or a series of adverse tsunamis, maybe the complete melting of the Antarctic ice sheet, or the re-entry of the Ice Age. If these disasters happen, do humans really need to emigrate to other planets? I don't think so.

Fusarium wilt in Interstellar, for example, will eventually lead to the depletion of oxygen on Earth. Regardless of whether this setting has bug or not, if there is some kind of global "oxygen crisis", no matter how bad our situation is, we believe that the earth is still the most livable planet compared to other planets in the solar system.

So in most cases, the disasters we encounter are far from considering interstellar migration. Our priority should be to find ways to improve the earth's environment, and then fail to build a large-scale artificial facility like the dungeon in "wandering the Earth".

Unless we encounter some kind of super-destructive disaster big enough to completely reduce the whole planet to purgatory, then mankind will really have to consider the possibility of leaving the earth.

However, leaving Earth does not have to live on another planet, we can also build a huge space city like Plan An in Interstellar, but it is a real problem to transport such a huge building into space.

According to the settings in Interstellar, solving this problem requires humans to be able to control gravity. This is equivalent to artificially modifying the gravitational constant to produce local gravity anomalies somewhere, thus transporting giant buildings into space. This seemingly "impossible" method is achieved in another "impossible" way: Cooper, who enters the black hole, controls the hands of Murphy's watch through gravitation. then the quantum information to solve the problem of gravity is transmitted from the black hole.

It can be seen that this partial theory of Interstellar may be in line with theoretical physics, but it is too science fiction from a practical point of view. If a space elevator like that in wandering Earth 2 can be realized, I think it would be easier to use it to transport materials and build a space city.

But either way, this method of building a large space city in the short term is not very realistic. In comparison, it seems more reliable to send people to other planets to use local materials, and then "big construction" seems more reliable.

If you emigrate to other planets, Mars should be the preferred target. At this time, we can see the foresight of the development of space technology, especially manned space flight. This kind of technology does not mean that rapid progress can be made in just a few years or even decades. It is a hurdle to send people up, another hurdle to be able to send people up in bulk, and another hurdle to enable those who are sent to survive smoothly on Mars. After all, the Martian has vividly shown us how difficult it is to survive on a planet that is short of water, lack of oxygen and lack of food.

Both Earth and Mars, like Mercury and Venus, are inner solar system planets close to the sun. For the inner solar system planets, one day they will face the threat that the sun will turn into a red giant. For example, in "wandering the Earth", the sun ages rapidly ahead of time and is about to expand into a red giant star to engulf the earth.

Scientifically speaking, normally about 5 billion years later, the sun will indeed expand to the orbit of Earth or even Mars. By then, even on Mars, we can't stay any longer. At this point, we can only continue to evacuate farther away, such as moving to the moons of gas giants such as Jupiter.

Europa and Enceladus, which had thick ice, were probably our best choices at that time. But the environment on these planets is worse than Mars, whether living on the surface of the ice or living in liquid oceans under the ice, when the human way of life will be completely changed.

However, at that time, I believe that the level of human science and technology can no longer be compared. Maybe humans already have the ability to travel interstellar distances, and even if the entire solar system is gone, we can continue to travel long distances to immigrate to exoplanets. At this time, it shows the significance of looking for habitable exoplanets, is it really like a trisomy person broadcasting everywhere to try his luck?

Whether it's building a nearby space city, migrating to Mars at close range, or interstellar voyage, the usual sci-fi plans don't take everyone away, but only some people or carry a human embryo bank away. But the wandering Earth plan is to take as many people as possible. Not only people, it should be said that the whole is packed and taken away together with the earth. It is equivalent to the fact that other people are just moving, and we are really moving.

Although the setting of "wandering Earth" is that only half of the population can enter the dungeon, as long as there is no technical problem, it is believed that it is at least theoretically feasible to build a dungeon that can accommodate everyone. And the biggest advantage of this scheme is that it has an ecological basis more than just taking people away. Although there was almost no life on the surface at that time, it was believed that there was a relatively stable biosphere in the dungeon.

However, this scheme seems perfect, but it is no less difficult or even more difficult to implement than the previous ones. At a time when controllable light nuclear fusion such as deuterium and tritium has not been completed, it is hard to imagine how heavy nuclear fusion like "burning stone" in "wandering the Earth" can be realized.

And driving a planet is not as good as flying a spaceship, as the so-called "small boat is easy to turn around". With such a big guy, it can be said that there is almost no mobility. If you think about it, the whole "brake age" took 42 years just to stop the earth from spinning. During this period, the climate around the world not only changed dramatically, but also had an impact on ocean currents, so it was very surprising to see seagulls at that time.

Whether it's Interstellar or wandering the Earth, sci-fi movies let us see the problems we may face in the future through imagination. In addition to satisfying our own curiosity about the universe, the exploration of space is also a long-term consideration for the future of mankind. Although there is a good chance that our generation or even generations will not experience this, through these excellent science fiction works, we can realize that no matter how much time is spanned, the wisdom and courage of human beings in the face of difficulties remain forever.

This article comes from the official account of Wechat: Linvo says ID:linvo001, author: Linvo

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