Natura - nature actualia - actual entities Mundus Plinius - physical world Astra Plinius - celestial bodies Universe (Supercluster) Virgo-Hydra-Centaurus Supercluster (Supercluster) Virgo Supercluster (Cluster) Local Group (Galaxy) Milky Way Galaxy veter. (Spiral arm) Sagittarius Arm (Bright nebula) IC 4703 (Ser) 7000 (Open cluster) M16 (Ser) - Eagle Nebula