Rockfalls on the moon leave their mark on the surface. A map of 136,610 rockfalls indicates that asteroid impacts are a likely cause.

"This is a 200-year old question. If we can solve that, we would definitely be rock stars."

A new model can explain phenomena taking place miles beneath the Earth’s surface under incredible pressures and temperatures that lead to earthquakes.

Scientists braved the heat to answer a question about oxygen and "Snowball Earth," a period when the oceans virtually froze from the poles to the equator.

For 10 years, researchers have used sensors they installed on the Matterhorn mountain to watch for changes and natural hazards.

Lunar samples from the Apollo missions are still valuable to researchers studying the origins of the moon.

Scientists have debated what kept a long period of global cooling going 15 million years ago. New research may debunk a popular theory.

It has been extremely difficult to assign meteorites called mesosiderites to a specific asteroid. New research indicates their age and origin.

Strings of volcanoes colliding with continents may set our planet's long-term climate.