The discovery of a massive crater formed by the impact of a meteorite more than 3.5 billion years ago is changing the way ...

This ancient period of deep freeze, known as the Neoproterozoic Era, or “Snowball Earth,” lasted from about 1 billion to 543 million years ago. During that time, landmasses consolidated into a ...

Earth once hosted more than 10,000 species of these ancient marine predators. Find out how they lived, when they vanished, and how much we know about them today. Based on the fossil record ...