A gigantic space rock that slammed into Earth more than three billion years ago grievously wounded the biosphere—and then helped it heal ...

Scientists know that the world’s continents emerged during the Archean eon, which stretched from about 4 to 2.5 billion years ago. But how they formed is a tougher question. A new study from the ...

The oxygenation event initially wiped out many of their competitors, allowing stromatolites to dominate the biosphere during the Archean eon, when life had just begun to bud. However, as life ...