Why can't Mars be inhabited?

Question 1: Why can't Mars and the moon be inhabited? There is almost no atmosphere on Mars and the moon, which leads to direct sunlight and cannot keep warm. More than 200 degrees in the daytime, and MINUS 100 degrees at night. Without protection, any living thing will be scalded to death during the day and frozen to death at night.

Because there is no atmosphere, no air, humans can't breathe when they go up, and they will suffocate;

Because there is no atmosphere, the magnetic field is also very weak, and the strong ultraviolet radiation is serious, so life can not survive;

There is no atmospheric pressure and it is close to vacuum. Without protection, the human body will explode because of the pressure difference between inside and outside.

Question 2: Why is Mars unfit for human habitation? There are several points:

The atmosphere is thin, only 1% of the earth's, mainly composed of carbon dioxide (95.3%), nitrogen (2.7%), argon (1.6%), trace oxygen (0. 15%) and water vapor (0.03%).

Because of the thin atmosphere and low carbon dioxide content, it is impossible to form a greenhouse effect. The temperature on Mars has been kept below zero, with an average temperature of minus 50 degrees in summer and minus 120 degrees in winter.

With almost no oxygen, people will suffocate immediately;

Because the atmosphere is thin, a lot of ultraviolet rays can shine on the surface of Mars.

Although Mars has residual water ice in some places (there was an ocean on Mars more than 30 years ago), it is difficult to find it.

There is no environment and resources (food) like the earth.

Note that although Mars is uninhabitable, its environment is at least much better than other planets in the solar system. Mars has a polar cap, upper dry ice (solid carbon dioxide) and lower water ice. This remains more than 3 billion years ago, when Mars had the same atmosphere as the Earth, a warm climate and oceans in the northern hemisphere.

Handwritten typing, I hope it can be adopted!

Question 3: Why can't people live on Mars without the necessary conditions for survival? 1, gas 2, water.

Question 4: Mars is uninhabitable. Why does the United States still say that there is no absolute thing to immigrate to Mars? Mars is not suitable for human habitation, but don't you know the ability of human beings? It is still possible to build an area suitable for human habitation, just like the space station. No one can tell what will happen in the future, and there may be factors that humans have not discovered. In short, the future is full of all possibilities, but I don't know if our generation can catch up!