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-satellite system) Martian System
                             (Planet) Mars veter.
                               "history" (Mars)
                                 1 (Period) pre-Noachian Period (Mars)
                                 2.1 (Epoch) Early Noachian Epoch (Mars)
                                 2.2 (Epoch) Middle Noachian Epoch (Mars)
                                 2.3 (Epoch) Late Noachian Epoch (Mars)
                                 3.1 (Epoch) Early Hesperian Epoch (Mars)
                                 3.2 (Epoch) Late Hesperian Epoch (Mars)
                                 4.1 (Epoch) Early Amazonian Epoch (Mars)
                                 4.2 (Epoch) Middle Amazonian Epoch (Mars)
                                 4.3 (Epoch) Late Amazonian Epoch (Mars)