Timeline of Universe's and Earth's History in Galactic Years
The following list assumes that 1 galactic year is approximately 225 million years.
| about 60 galactic years ago | Big Bang |
| about 59 galactic years ago | Birth of the Milky Way |
| 20 galactic years ago | Birth of the Sun |
| 16 galactic years ago | Oceans appear on Earth |
| 15 galactic years ago | Life begins on Earth |
| 14 galactic years ago | Prokaryotes appear |
| 13 galactic years ago | Bacteria appear |
| 10 galactic years ago | Stable continents appear |
| 7 galactic years ago | Eukaryotes appear |
| 4 galactic years ago | Multicellular organisms appear |
| 2.8 galactic years ago | Cambrian explosion |
| 1 galactic year ago | Permian–Triassic extinction event |
| 0.26 galactic year ago | Cretaceous–Paleogene extinction event |
| 0.001 galactic year ago | Appearance of modern humans |
| Present day | |
|---|---|
| 6 galactic years in the future | Sun's habitable zone moves outside of the Earth's orbit |
| 10 galactic years in the future | The Milky Way and Andromeda Galaxy begin to collide |
| 30 galactic years in the future | Sun ejects a planetary nebula, leaving behind a white dwarf |
Read more about this topic: Galactic Year
Famous quotes containing the words universe, earth, history, galactic and/or years:
“By it, is the universe made safe and habitable, not by science or power.”
—Ralph Waldo Emerson (1803–1882)
“the plump of my belly, the
hollow of your
groin, as a constellation,
how it leans from earth to
dawn in a gesture of
play....”
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—Jimmy Carter (James Earl Carter, Jr.)
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—Barbara Ehrenreich (b. 1941)
“The anarchy, assassination, and sacrilege by which the Kingdom of France has been disgraced, desolated, and polluted for some years past cannot but have excited the strongest emotions of horror in every virtuous Briton. But within these days our hearts have been pierced by the recital of proceedings in that country more brutal than any recorded in the annals of the world.”
—James Boswell (1740–1795)