How to build an artificial planet in space empire 4

First of all, science and technology should be high enough, that is, technology to improve the ability of resource integration facilities. Then build several spaceships (that is, ships with shipyard accessories). Then the base technology should be high enough to build a star base. Then drive the spacecraft to the star of a single star galaxy and build various pedestal accessories (1 center, 10 gravity plate, 10 cable). It will take more than 2 years to build, and then assemble after all the penalty kicks are made. The area of spherical celestial bodies is much larger than that of annular celestial bodies. Due to the huge ground area of such celestial bodies, many weapon platforms can be installed, which is difficult to capture with the cooperation of the stationed fleet. I remember once fighting with people, mobilizing hundreds of ships to storm and releasing more than 100 anti-planet drones. I don't know how many planes were put in, but in the end, both sides lost. Spherical celestial bodies are difficult to attack, and it is more cost-effective to find them by espionage.