How to fold the starship

The extended information is as follows:

The weapons used in interplanetary wars have the following purposes: 1) Sending troops from distant places between planets to destroy the enemy's planetary defense system, thus occupying and controlling colonial stars or hostile planets. Goal 2: Destroy the enemy starship to occupy part or all of the star domain. Goal 3: Escort unarmed ships.

The unsolved technical problems of starship are speed, energy and radar detectors. The main purpose of building a starship is to find another planet suitable for human habitation. The earth can't be the eternal home of mankind. With the exhaustion of various resources, human beings will leave here sooner or later, but some people may stay on the earth and develop new energy sources for survival.

In addition, if there is not enough energy and superluminal, it is difficult to find such a planet, and the manufacture of starships is a long-term project. The best solution is to transform the moon and Mars into planets suitable for human survival and build a large space station in the universe for human survival.

Slowly extend to another galaxy that can be immigrated by human exploration spacecraft or exploration satellites (provided that humans cannot directly move to a galaxy that can be immigrated by fast and high-speed spacecraft). It is really impossible to transform a planet that is more suitable for human survival, or to build a small imitation ecosystem.