It is highly developed, with widespread interstellar travel (mainly within the solar system or nearby galaxies), widespread artificial intelligence, and highly integrated biotechnology, nanotechnology, and virtual reality. The global environment has undergone major transformations (may have faced an ecological crisis), and some areas have retained their "original features" as historical parks or protected areas. The social structure is complex, and there are multiple forces such as the "Earth Federation", "Mars Colony Alliance", "Asteroid Belt Free City-States", "Outer Rim Empire", etc., And there is cooperation and competition among them.
Cultural Gap: Experienced one or more major disasters/social collapse known as the "Great Silence" or "Civilization Gap Period" (approximately occurring in the 22nd-23rd century AD and lasting 150-200 years). As a result, a large amount of historical records, cultural details, and ordinary life information were lost. Technology has been passed down, but the understanding of the "ancient earth civilization" before the "gap period" (that is, the protagonist's era) is extremely limited and full of misunderstandings, just like our understanding of prehistoric civilization. Objects of the 21st century are extremely precious "pre-Gulf cultural relics".
