Geologists watch over the massive volcano beneath Yellowstone National Park.

Nowhere else are primates as diverse…or as endangered.

Pluto in 2015...or bust.

What does it take to plot a Universe's worth of space objects?

How tsunami researchers are trying to get ahead of the next big wave.

The Milky Way and Andromeda Galaxy are on a collision course.

Lessons from one of the oldest marine parks may help restore our global oceans.

Most asteroids and comets don't pass anywhere near Earth. Most.

Glaciologists are racing to core the largest tropical ice cap before it melts.

Its metropolitan area has grown more than 300 percent in recent decades.