Translations:System/4/en
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- Primary Star
- The largest (in terms of mass) star in the system is always designated as the primary.
- Secondary Star(s)
- The system may include one or more additional stars in orbit around (or co-orbital with) the primary star. These include stellar objects like Brown Dwarfs, White Dwarf stars, Neutron Stars, and Black Holes.
- Gas Giants
- These are the largest of the planets, consisting of a hydrogen atmosphere without any surface.
- Planet
- A planet is a single body with enough gravity to form a sphere. They may or may not have an atmosphere, hydrosphere, or be inhabited.
- Moon
- A single body orbiting a planet or gas giant. Some moons may be the size of planets, and may be co-orbital with their parent planet.
- Planetoid
- A single small body, too small to have the gravity to form a sphere. In some cases the is a group of Planetoids gathered into a single orbit, which is termed a Planetoid Belt or Asteroid Belt