bsunter on Nostr: I’m reading Carl Sagan’s cosmos. One thing I learned was how long bacteria were ...

I’m reading Carl Sagan’s cosmos. One thing I learned was how long bacteria were the only life on earth. They were the main form of life for billions of years


4.54B years ago: Earth forms.
3.8B years ago: Life begins with bacteria.
541M years ago: Cambrian explosion makes complex life.
2M years ago: Genus Homo emerges.
300K years ago: Modern humans