For humans, the earth is a nearly perfect planet and is very suitable for humans to live in. But the perfection of the earth is also temporary. One day in the future, the earth will become no longer livable.
As the sun expands into red giant , the light intensity will gradually increase, the earth's surface temperature will gradually rise, and the ocean will evaporate. In addition, there are many human factors that affect the earth's environment, such as victory, genetic engineering, terrible viruses, and the deterioration of the environment.
So, humans cannot stay on the earth forever. We must prepare for the future, find a second earth, and then conduct interstellar immigration .
But does such a planet exist? Apart from the earth, are there any other planets suitable for humans to live in? As far as our solar system is concerned, there are several major planets that can serve as target objects for future interstellar migration.
The first thing that comes to mind is the celestial body closest to us, the moon. The biggest advantage of the moon is its distance. It is only 380,000 kilometers away from the earth, and it only takes a few days to fly to the moon. Moreover, humans have already set foot on the moon.
Of course, the moon also has fatal defects, no atmosphere and magnetic field protection, and the surface temperature is very low.
However, humans can build their residence in ancient lava tubes. At the same time, there are rich mineral resources on the moon, such as aluminum, iron, titanium, and the highly anticipated helium-3.
The second celestial object is Mars , the most discussed interstellar immigrant object. NASA is also planning to land manned on Mars around 2035.
Relatively speaking, Mars and Earth have some similarities, such as the time of day is about 24 hours, and there are four seasons.
However, Mars indicates that the average temperature is as low as minus 55 degrees, and only the summer temperature in the equatorial region can reach 20 degrees briefly. In addition, the sandstorm rampant on Mars will bring great danger to the first batch of pioneers and human settlements.
The third celestial body, Ceres . It is estimated that many people do not know much about Ceres. It is an dwarf planet located in the asteroid belt . Scientists predict that 25% of the volume on Ceres is water, and it is fresh water, with a greater fresh water content than fresh water on Earth.
Because Ceres is very small in mass and gravity, it can be used as a perfect transit base for future human interstellar travel. The cargo transportation there is very convenient and efficient, which is more conducive to humans' future exploitation of resources on asteroids.
and Europa , also known as Europa , is the fourth largest satellite of Jupiter , covered by thick ice shells, under which is the deep ocean.
The surface temperature on Europa is very low, close to minus 200 degrees. However, the ocean beneath the ice shell is likely to be the paradise of life.
The last one is Saturn 's largest moon, Titan. Living on Titan is not impossible, it has an atmosphere, 90% of which is nitrogen , and the atmospheric pressure is about 1.5 times that of the Earth's atmospheric pressure. These superior conditions are not available to other planets. Living on Titan does not require wearing bulky space suits, just an oxygen cover and an insulating suit.
However, the surface temperature of Titan is also very low, only minus 180 degrees. The above carbon and hydrogen gas is also prone to explosion after mixing with oxygen .
can be seen that among the above five celestial bodies, each celestial body has its own advantages and disadvantages, and their environment is very harsh compared to the earth's environment.
But this is also a problem that we must face in interstellar immigration. It is difficult to find a planet exactly like the earth for humans to settle. Humans must make choices in the process of choice, find a planet that is most suitable for humans to live in, and build a second home for humans!
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