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:
“The life of man is of no greater importance to the universe than that of an oyster.”
—David Hume (1711–1776)
“An underground grower, blind and a common brown;
Got a misshapen look, it’s nudged where it could;
Simple as soil yet crowded as earth with all.”
—Richard Wilbur (b. 1921)
“The history of American politics is littered with bodies of people who took so pure a position that they had no clout at all.”
—Ben C. Bradlee (b. 1921)
“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)
“The years of imprisonment hardened me.... Perhaps if you have been given a moment to hold back and wait for the next blow, your emotions wouldn’t be blunted as they have been in my case. When it happens every day of your life, when that pain becomes a way of life, I no longer have the emotion of fear. ... there is no longer anything I can fear. There is nothing the government has not done to me. There isn’t any pain I haven’t known.”
—Winnie Mandela (b. 1936)