It is not ruled out that human beings will become nano-scale in the future.

"One day in the future, will mankind perish?" This is a question from a netizen. I have some personal views on this.

My point is that human beings are very fragile creatures in nature, because human beings are not particularly prominent in many physiological functions. Even compared with mice, human beings have poor reproductive ability and adaptability. But human beings have great wisdom and can develop science and technology. With the blessing of science and technology, the viability can be greatly improved, thus delaying or even avoiding species extinction. In the foreseeable future, if human beings can't develop the ability of interstellar migration, they will sit still and die, and extinction is almost inevitable.

You know, even if we avoid nuclear war and solve the energy problem, the sun we rely on will change, that is, according to the speculation of stellar physics, she will become a red giant in billions of years. And this change process is irreversible. By then, the earth will be scorched by the red giant star and there will be no life. In order to avoid this ending, human beings have to master the technology of interstellar migration, thus jumping out of the solar system and looking for planets suitable for settlement in other galaxies. Even if we can't find a planet to live on for a long time, we should at least be able to preserve the fire of human civilization on generations of starships.

Our sun is a very unremarkable star in the Milky Way, with medium mass, and is currently in middle age. But the sun will come to an end sooner or later. Before the end of the sun, it will go through a historical stage called red giant. After the sun becomes a red giant, the surface of the red giant will expand many times to the outside world, spraying hot gas. First, she will devour Venus, and then its surface will continue to move forward until it reaches the orbital position of the earth.

If there are people living on the earth at this time, they will look up at the sky and find a huge fireball filled the whole sky. Soon, all the air on the earth evaporated, the ocean boiled and then turned into water vapor, and finally the water vapor evaporated. The computer simulated the whole process and found that the surface of the red giant had just swallowed up the earth. Although its high temperature can't melt the whole earth, the surface temperature of the earth will reach 3500~4000 degrees Celsius. At such a high temperature, there is no atmosphere, no ocean, no life, and the surface is wrapped in lava. Even if humans hide in underground bunkers dozens of kilometers deep from the surface, they can't resist death.

This is the end of mankind and the end of the earth.

If you want to survive, you must know how to resist the red giant's devouring of the earth. In order to cope with this doomsday disaster, scientists put forward two sets of plans. One is to move the orbit of the whole earth outward through a "planetary propeller". But the crust is very thin, with an average thickness of only 17 km. In order to move the earth, a huge driving force must be applied to the interior of the earth, which is unbearable for the fragile crust.

For example, the whole earth is a fragile raw egg, and the crust is the eggshell of the egg. If you want to push the egg, the pressure required will crush the shell.

Another plan is to plan ahead, develop a series of aerospace and life technologies, and evolve the technology of interstellar migration. Only by bravely advancing into the deep space of the universe can human beings save themselves. How can mankind avoid the fate of extinction? Is to have the ability of interstellar migration.

The ideal is lofty, but the universe is also an extremely dangerous "hell". The universe is full of pulsars and white dwarfs, and these star fields are not suitable for humans to enter. In the event of a supernova explosion, it is difficult for human starships to resist this huge energy shock wave, which can be said to be a dead end. In addition, there are mysterious black holes that can devour all substances. When the starship meets a black hole, there is no turning back. According to the theory, once a starship breaks into the horizon of a black hole, it will always run to a singularity, and even if it has superluminal speed, it cannot return. The so-called "superluminal can be separated from black holes" is a wrong inference. We don't know how many black holes are all over the Milky Way, and these "gravity traps" will be the nightmare of all starships.

In spite of the danger, human beings have the courage to try. If you can't master the technology of interstellar migration, the consequences will be unimaginable, and it is likely to be completely annihilated.

Before mastering the technology of interstellar migration, human beings need to experiment with the solar system, and first master the skills of transforming and settling extraterrestrial planets. For example, Mars, the fourth planet in the solar system from the inside out, is a suitable experimental site for human migration. The main problem is that if the Martian environment is transformed into an environment similar to the earth, the result of scientists' calculation will be that all the resources of the earth will be exhausted. This is obviously a very uneconomical transaction. The second best way for scientists is to put forward a biological genetic modification plan, which is to directly modify the genes of human babies born on Mars so that they can adapt to the surface environment of Mars at birth.

For example, at present, the main atmospheric component of Mars is carbon dioxide, accounting for 95.3% of the total atmospheric content of Mars. This is obviously not suitable for human normal breathing needs. However, if the atmospheric composition of Mars is close to the Earth, it will take a lot of resources and time. But if human Mars babies are genetically modified, they can quickly adapt to 70% carbon dioxide after birth. The offspring of these babies with new genes will automatically inherit their parents' abilities and live a very moist life on Mars. In this case, the cost and difficulty of transforming the planet will be greatly reduced.

After the conquest of Mars, mankind must continue to expand, and it is inevitable to March outside the solar system. Transgene will be the normal means. Descendants of human beings can even greatly change their appearance. For example, they can swim directly in the sulfuric acid sea of extraterrestrial planets, float in the high-temperature atmosphere, and be exposed to glaciers at minus 120 degrees Celsius ... even in order to use less energy, they can change the individual size to only nanometer size. Maybe it's okay to turn humans into nanoscale. The smallness of human beings means that there will be few resources to sustain life. The spacecraft carrying them will need less energy to drive them. Smaller dimensions can also etch circuits on a microscopic scale.

In the future, the descendants of human beings who are all over the universe will have a completely different individual form from the present human beings on earth.

In order to preserve the human kindling, these changes seem to be the inevitable result.

Only by constantly marching into the sea of stars can we accumulate experience and develop science and technology, thus increasing the probability of the continuation of our own species.

Of course, interstellar migration is still far away. Even if we conquer the solar system, it will take at least thousands or even hundreds of thousands of years. Before that, most of us humans have to stay on the earth honestly for a long time. Since we can't leave the earth for the time being and find another way out, we must do everything possible to protect Mother Earth. Maintaining the harmony between human beings and the natural environment is a crucial issue. If the earth's resources are exploited rudely and without restriction, the energy revolution cannot be born and the achievements of human civilization cannot be maintained.

I saw a friend say; "The rapid progress of human science and technology, but just a few hundred years. It is often said that the increasing energy consumption will destroy the relatively balanced natural environment sooner or later. However, don't ignore that the progress of science and technology is also improving the natural environment, and this improvement process will gradually accelerate. " I deeply agree with this. I believe that with the continuous progress of science and technology, human beings can find ways to live in harmony with the natural environment.

Author: Questioner