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) Orion Arm
                     (Region) Local Bubble
                       Local Interstellar Cloud
                         (Planetary system) Solar System
                           (Planet) Mercury veter.
                             1 Craters
                             2 Dorsa - scarps
                             3 Fossae
                             4 Montes - mountains
                             5 Planitiae - plains and basins
                             6 Rupes - ridges
                             7 Valles - valleys