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" †"Precambrian" (4600 - 541.0 Ma) (Eon) †Proterozoic Eon (2500 - 541.0 Ma) (Era) †Paleoproterozoic Era (2500 - 1600 Ma) (Period) †Orosirian Period (2050 - 1800 Ma)