Resumen de The planet Earth was blue long before we knew
Earth may have become the blue planet just 200 million years after it formed, making it a welcoming home for life hundreds of millions of years earlier than people thought. But hell may actually have been relatively shortlived. Judith Coggon and her colleagues at the University of Bonn in Germany have found that rocks in Greenland contain a chemical signature from the mantle 4.1 billion years ago--just 400 million years after Earth was born. That signal suggests conditions at the time may have been more like they are today than people expected.
