(1) results in Blog

Micrometeorites extracted from ancient rocks in Australia contain minerals that suggest oxygen was present in the upper atmosphere 2.7 billion years ago. (Credit: Andrew Tomkins)

May 16, 2016

New Insights into Earth’s Ancient Atmosphere

Although it’s hard to imagine, Earth didn’t always have the oxygen-rich atmosphere we breathe today. In fact, until about two and a half billion years ago, the air contained almost no oxygen gas at all. You...