The solar system completes one revolution around the center of the Milky Way in 230 million years and that's called one galactic year. And according to that scale:
The universe originated 60 galactic years ago, 14 galactic hours after that the universe became transparent with the release of cosmic microwave background radiation (CMB).
Galaxies started forming 58 galactic years ago. Sun formed 22 galactic years ago and the earth 20 galactic years ago and the moon 160 galactic days after that.
Life on the earth started 15 galactic years ago, photosynthesis 14 galactic years ago, nucleus formation in living cells 11 galactic years ago, multicellular organisms 3 galactic years ago, plants on the land 2 galactic years ago, animals 1.5 galactic years ago, and dinosaurs went extinct 103 galactic days ago.
Modern humans evolved 7.5 galactic hours ago, human civilization started 27 galactic minutes ago, and an average human life is 12 galactic seconds.
Four galactic years from now the sun will be too hot to boil oceans and 22 galactic years from now it will have expanded to engulf the earth erasing the traces of any existence on the planet.
1 comment:
Fascinating. We are youngsters!
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