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) Norma Arm
                   (Spiral arm) Scutum–Centaurus Arm
                   (Spiral arm) Sagittarius Arm
                   (Spiral arm) Perseus Arm
                   (Spiral arm) Cygnus Arm
                   (Spiral arm) Orion Arm
                     0 (Region) Local Bubble
                     2 Auriga-Perseus Cloud
                     3d425 Region Pleiades Bubble
                     4 Taurus Dark Cloud
                     5d330 (Region) Loop I Bubble
                     6d420 (Region) Loop II Bubble
                     7 (Region) Loop III Bubble
                     8 Region GSH 238+00+09 Heiles, 1998