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:
“When we lose love, we lose also our identification with the universe and with eternal values—an identification which alone makes it possible for us to lay our lives on the altar for what we believe.”
—Sarah Patton Boyle, U.S. civil rights activist and author. The Desegregated Heart, part 3, ch. 2 (1962)
“It is, I think, an indisputable fact that Americans are, as Americans, the most self-conscious people in the world, and the most addicted to the belief that the other nations of the earth are in a conspiracy to under value them.”
—Henry James (1843–1916)
“History takes time.... History makes memory.”
—Gertrude Stein (1874–1946)
“In sci-fi convention, life-forms that hadn’t developed space travel were mere prehistory—horse-shoe crabs of the cosmic scene—and something of the humiliation of being stuck on a provincial planet in a galactic backwater has stayed with me ever since.”
—Barbara Ehrenreich (b. 1941)
“If you feed a man, and wash his clothes, and borne his children, you and that man are married, that man is yours. If you sweep a house, and tend its fires and fill its stoves, and there is love in you all the years you are doing this, then you and that house are married, that house is yours.”
—Truman Capote (20th century)