If curiosity is the eternal driving force for human beings to understand the universe, then practical needs are the first driving force for exploring the universe. Humanity has never stopped imagining extraterrestrial life. In the first year of the new era, 2000, a big explosion occurred at the edge of the galaxy, linking two spaces that would have barely overlapped in the first place. A signal suddenly came from the depths of the universe - "Get to know us, we are Tasnians."
Concept: alien invasion, evolutionary flow, defending homeland