Cosmic Timeline (WWCoC)
- 4.6 Billion Years Ago/Ga (Gigaanum): The Sun and Solar System come into being
- 4.54 Ga: Earth Forms
- 4.5 Ga: Moon Forms
- 4.4 Ga: Oceans Form
- 4.2 Ga: Earliest possible emergence of life on earth
- 3.5 Ga: Life develops Photosynthesis
- 717-660 Million Years Ago/Ma (Megaanum): Sturtian Glacial Episode (Snowball Earth)
- 650-635 Ma: Marinoan Glacial Episode (Snowball Earth)
- 575 Ma: Avalon Explosion
- 525 Ma: Cambrian Explosion
- 444-445 Ma: Late Ordovician Mass Extinction Event
- 327 Ma: Late Devonian Mass Extinction Event
- 252 Ma: Permian-Triassic Extinction Event
- 201.3 Ma: Triassic-Jurassic Extinction Event
- 66 Ma: Cretaceous-Paleogene Extinction Event
- 15-12 Ma: Solar System Crosses Through the Radcliffe Wave