If you want to move to another planet, humans may regard Mars as the first choice for moving to another planet. Why?

Mars is the earth-like planet closest to the earth's environment in the solar system. Perihelion is 55 million kilometers away from the earth, and it is adjacent to the earth on the outer side of the earth every 15 years. It takes about three months to take the state-of-the-art space shuttle (8 km/s), and it's only one way.

But the atmosphere of Mars is thin, only 1% of the earth, and 95% is carbon dioxide.

Mars is the planet with the largest number of probes launched by human beings except the moon. The earliest Mars probes, including Viking, Odyssey, Spirit, Opportunity and Curiosity, all belong to the United States. The former Soviet Union and Japan also launched Mars probes, but both ended in failure. The detection results on the surface of Mars show that there is water ice on Mars, with huge reserves. Perhaps there are many secrets that the United States has not disclosed.

There are many sci-fi movies about the climate change of Mars, which is the dream of human beings about interstellar migration. Mars is the only planet in the solar system for human migration in the distant future. Other planets are either too close to the sun (mercury, Venus) or too far away from the sun, and the climate is either extremely hot or extremely cold. From this point of view, Mars is the closest planet to the "livable zone" in the solar system except the Earth. Of course, rebuilding the atmosphere of Mars is a long and complicated systematic project, and there is a more serious problem that the geomagnetic field of Mars has already disappeared, which is currently only 1% of that of the Earth, but scientists speculate that the geomagnetic field of Mars was close to that of the Earth about 4 billion years ago. This may be one of the main reasons for the drastic climate change on Mars, and it is impossible to deflect the high-energy charged particle flow from the sun. This problem can only be solved when human science and technology civilization is highly developed in the future.