About 2.5 billion years ago, free oxygen first started to accumulate to meaningful levels in Earth’s atmosphere, setting the stage for the rise of complex...
Atmospheric oxygen is thought to have played a vital role in the evolution of complex multicellular organisms. The so-called oxygen control hypothesis...
The existence of habitable alien worlds has been a mainstay of popular culture for more than a century. In the 19th century, astronomers believed that...
Approximately 2.1-billion-year-old fossilized tracks discovered in Gabon suggest the existence of a cluster of single cells that came together to form...
An international team of researchers from Australia and the United Kingdom has made a surprising discovery about the chemistry of Earth’s upper atmosphere...
An analysis of three-billion-year-old soils from South Africa shows that oxygen appeared in the atmosphere more than 600 million years earlier than previously...
