| Prehistoric Scratchpad PhBP Po10BP |
Timeline of earth's history in galactic years[]
In this list, 1 galactic year (GY) = 225 million years Hadean Eon (0 GY)
- 0 GY: Birth of the Sun
Archean Eon (3 GY)
- 4 GY: Oceans appear on Earth
- 5 GY: Life begins
- 6 GY: Prokaryotes appear
- 7 GY: Bacteria appear
- 10 GY: Stable continents appear
Proterozoic Eon (9 GY)
- 13 GY: Eukaryotes appear
- 16 GY: Multicellular organisms appear
Phanerozoic Eon (18 GY)
- 17.8 GY: Cambrian explosion
- 19 GY: Great Dying
- 19.6 GY: K–T extinction event
- 19.999 GY: Appearance of modern humans
- 20 GY: Present day