The anomalies in the sub star system.
The space stations orbiting the stellar objects in the sub star system.
The planetary systems in the sub star system.
The stellar objects in the sub star system. Usually, there is only one star in the sub star system. However, we can imagine more complex scenarios like 2 neutron stars orbiting each other while having planets orbiting them from far away.
Data model for a sub star system. It holds all the information necessary to generate and render a sub star system. A typical star system like Sol, which has a single star and planets orbiting it, a single sub star system can describe the whole star system.