The Interstellar Nine Gates are ancient yet advanced extraterrestrial technology. They exist in the Ninefold Universe and have been around for hundreds of millions of years.
Between each of the Ninefold Universes is a gate. Each gate uses warped time and nine-dimensional space to instantly transport matter and energy.
Blue Star lies at the Ninth Gate. The warping of time and overlapping of space between the Ninefold Universes form black holes. These black holes generate tremendous gravitational pull, drawing in matter and energy from the outside.
Wormholes are directional tunnels within black holes that transport matter and energy along a fixed route.
The solar system where Blue Star is located is one of the hundreds of billions of star systems in the Milky Way, which is itself just one of the hundreds of billions of galaxies in the Ninthfold Universe.
The Interstellar Era began in 2090. In the 2090s, the strongest military force in Shenzhou was the Space Force, whose most powerful combat unit was the Galaxy Fleet Corps.
The Galaxy Fleet Corps had three subordinate guard units: the Nine Heavens Guard, the Glory Guard, and the Tiancheng Guard.
