It has been countless years since mankind entered unknown territory. The aircraft rises and falls on the planet, and its mechanical tentacles extend in all directions, as if it can conquer the stars. The calendar has changed several generations, and it is now 719 years after the explosion of the Third Morning Star. For humans, this is as ordinary and insignificant as a speck of dust in the endless era. It is the third middle period of endless darkness.
Under the light of the artificial canopy, there are gathering areas of survivors and a new country.
It is an imaginary science fiction world view. Please don't compete with it if it is not rigorous in the scientific part. (Compare your heart)
A one-sentence synopsis from A Tale of Two Cities.