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) Earth System (Planet) Earth veter. "history" (Earth) "global geochronologic units" (Eon) Phanerozoic Eon (541.0 Ma - present) (Era) †Mesozoic Era (252.17 - 66.0 Ma) (Period) †Jurassic Period (201.3 - 145.0 Ma) (Epoch) †Middle Jurassic Epoch (174.1 - 163.5 Ma) 1 (Age) †Aalenian Age (174.1 - 170.3 Ma) 2 (Age) †Bajocian Age (170.3 - 168.3 Ma) 3 (Age) †Bathonian Age (168.3 - 166.1 Ma) 4 (Age) †Callovian Age (166.1 - 163.5 Ma)