Observations of Extraterrestrial Civilizations

The universe should be colorful. The worlds can only be similar, not the same. Even if they are exactly the same environment, the creatures growing in them will not be exactly the same. As an observer, Li Xian needs to start from a planet similar to the earth, then to the world of climbing towers, mapping the world... Step by step to appreciate the various forms of the universe and the unique style of each planet.