Earth

To understand what Americans are experiencing with this winter blast, we need to look more than 20 miles above the surface of Earth, to the stratospheric polar vortex.

A 250th anniversary only comes once in a lifetime.

Antarctica's subglacial bedrock was previously one of the least-mapped planetary surfaces in our solar system.

The image shows just how large and devastating these events can be.

Greenland's mountains greatly affect local climate patterns.

Scientists studying Jurassic rocks in China found that cyclical changes in Earth's orbit affected not only the climate, but also the development of shale oil reserves.

Iceberg A23-A has been around since the Chernobyl explosion and Space Shuttle Challenger accident...but perhaps not for much longer.

The reservoir seen in this image is sometimes referred to as the "eye of Quebec."

Do you want to build a snowman?

"I am the watcher on the walls."