Earth’s Oxygen Rise Helps Search for Life

By analyzing the oxygen content of ancient, iron-rich sedimentary rocks, scientists determined just how low oxygen levels were before life began to flourish.

Beth Johnson
4 min readFeb 5, 2022

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IMAGE: Ironstones deposited on the seafloor nearly two billion years ago now occur as rocky outcrops along the lakeshore of Tu Nedhé (Northwest Territories, Canada). CREDIT: Devon Cole

A lot of times in science, to understand where you are and what will be, you have to look back at where you came from. In the search…

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Beth Johnson

Planetary scientist, podcast host. Communication specialist for SETI Institute and Planetary Science Institute. Buy me a coffee: https://ko-fi.com/planetarypan