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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