Around 700 million years ago, the Earth cooled so much that scientists believe massive ice sheets encased the entire planet ...

Scientists have calculated the Earth to be 4.54 billion years old, with an uncertainty of 50 million years on either side.

A series of rocks hiding around Colorado's Rocky Mountains may hold clues to a frigid period in Earth's past when glaciers several miles thick covered the entire planet.

Imagine a world where continents are fused into one massive landmass, and life as we know it is on the brink of ...