In the whole history of Earth's climate, few events are as extreme as those that geologists call "Snowball Earth." "These are times when geologic evidence indicates Earth froze over, essentially from ...

Our species likes it cold. Homo sapiens evolved in — and still inhabits — one of Earth’s rare and fragile ice ages, periods distinguished not by an abundance of saber-toothed cats and woolly mammoths ...

About 4.5 billion years ago, the most momentous event in the history of Earth occurred: a huge celestial body called Theia collided with the young Earth. How the collision unfolded and what exactly ...

Just in time for this year's Earth Day (22 April), we have a reminder of how the world looks. The most recent photo of ...