What does it mean that there is only one base in the earth script?

There is only one base in the earth script, which means immigration base. In other words, in the future, if our earth is destroyed, it will be impossible to survive. We need to establish an immigration base on Mars or the moon, which is also a transit station.

The explanation of this base is a transit station, that is, a transit station for human beings to find another planet that can survive.

When we can't find a suitable planet and the earth can't survive at all, we will go to Mars or the moon to establish an immigration base. This is the meaning of base in this article.

However, according to the article, it is a very sci-fi thing to establish a transit station on Mars or the moon, that is, to establish an immigration base, and it is a very distant thing.