An international team of researchers from Australia and the United Kingdom has made a surprising discovery about the chemistry of Earth’s upper atmosphere in the Archean era, about 2.7 billion years ago. One of 60 ancient micrometeorites from the Pilbara region in Western Australia. Image credit: Andrew Tomkins. The study, led by Monash University scientist Andrew Tomkins, indicates that Archean Earth’s upper atmosphere contained about the same...
