How did the stars annex the territory?

"First of all, the most important thing is to understand the surrounding geography. There are two main methods. The first is to explore by yourself and show it slowly. Too many scientific research ships will waste resources. I use wormholes to jump a little on the surface and explore the route from far to near. After finding a suitable expansion direction, the engineering ship will choose a galaxy with a suitable expansion direction at the far end, build a wormhole, and expand the scope of exploration and enclosure. Give up exploring the inner circle and the planet with pirates. Second, it is the most efficient, that is, exchange the star map with your opponent, so that you can know the surrounding situation as quickly as possible. Even knowing the planet suitable for immigrants is very effective.