Why does large-scale space colonization take at least 500 years?

For human beings, the solar system has surpassed the sky in human mind, but the solar system is only a drop in the ocean in the vast universe. The era we are living in now is the most developed era of mankind, but interstellar travel is still very slim and space is too vast! Even if we fly at the speed of light, it will take hundreds, tens of thousands and hundreds of millions of years to go to another galaxy. It is impossible for us humans to fly at or even exceed the speed of light at present.

I have read the relevant materials of Caiye.com before, and it is a long scientific research project to explore that human beings can migrate to other planets for survival activities. It must meet two natural conditions: first, it must be confirmed that there is a stable liquid water body (ocean) naturally formed on this planet, and there must be a biosphere to survive. After human migration, there will be various food sources to support various survival activities after human migration.

Secondly, human migration to other planets involves a series of key technologies, such as the speed of spacecraft, the observation and detection technology of livable planets, hibernation technology, the transformation of alien environment, computer technology and so on. The most critical technology is the speed of the spacecraft, which is the premise of everything. If humans want to move into space, they should at least be able to raise the speed of the spacecraft to 10% of the speed of light, which is the minimum technical requirement.

Therefore, it seems premature for human beings to colonize other celestial bodies at present, because the current rocket launch cost is very high, a space launch needs more than 50 million dollars, and the funds needed to colonize other planets are a bottomless pit. And to colonize other celestial bodies, we still need to face the problem of transformation. It is a challenge to build colonies and space stations on the surface of celestial bodies to transport materials while personnel are stationed on the surface of other celestial bodies.

At least until now, colonization is still an armchair strategist. If we have to give time, it will take at least 500 years. However, according to SPACEX, 100 may be eligible for immigration. For example, 1000 people immigrated to Mars and established colonies on Mars. This small-scale colonization is expected to be realized within 65,438+000 years.

But large-scale colonization will take at least 500 years, because NASA found that alien objects such as Mars are not a good thing, at least the human body is not ready. On the journey to Mars, the human body will encounter the harm of galactic radiation, and any radiation is fatal, but the current spacecraft does not have enough shielding technology.

The orbital height of the International Space Station is only 350 kilometers, and it is also protected by the earth's magnetic field. There is no need to consider the problem of galactic cosmic rays. At the height of solar flare, astronauts had to avoid it.

It can be seen that the human body is not ready to interfere with cosmic rays, even in a weightless environment. Astronauts returning from the space station still need model recovery training, otherwise their legs may lose their mobility due to bone loss, so it will take at least 500 years for humans to colonize Mars.

It is a long process for human beings to emigrate to another planet, and it is also a very long process to innovate the ecological environment on other planets, which may take tens of thousands of years.