Sixth grade Chinese Unit 3 Why can't humans move to Mars and the moon?

① The distance is too far.

It is 360,000 kilometers away from distance to the moon Earth, and it will take several days for the fastest aircraft to arrive. Mars is 78 million kilometers away from the earth, and it will take at least half a year to reach it.

② The environment is too bad.

There is no atmosphere, oxygen and liquid water on the moon, which can not effectively resist a lot of harmful radiation from the sun and the impact of meteorites in outer space; The moon has a great temperature difference between day and night, 100℃ during the day and-200℃ at night, which is not suitable for life at all.

Mars is a little better than the moon, with thin atmosphere, extremely low oxygen content, solid water and large temperature difference between day and night. During the day, 10℃ and at night-100℃, there is a global storm every year. But it is similar to the earth in other respects, and can be easily transformed into a livable environment, so it is the first choice for future immigrants, but it has no ability yet.

(3) Lack of resources.

Planetary migration is a big project, which requires a lot of manpower, material resources and financial resources. After a long period of R&D and manufacturing, even if it is successful, there are still dangerous factors in the migration process, which may lead to casualties and many problems such as food, water storage and energy supply for some reason. The process is very troublesome ...

So far, the earth is the only known planet that is really suitable for life. The details of a large number of earth-like exoplanets (super-earths) that have been discovered are still uncertain, and all of them are far from the earth without exception. It will take tens of thousands of years to go to the nearest place, not to mention the distant place, so it is of practical significance to protect the earth.