After a century of study, physicists have theories — but they’re still not 100% sure.

The 748-foot-long sediment core contains a record of roughly the past 23 million years, including periods when the planet's surface temperature was hotter than it is today ...

Analyses will help to reveal how far the West Antarctic Ice Sheet retreated in the past — and what it might do in the future.

Scientists have identified a rocky outer planet in a system where a gas giant was expected. The discovery challenges ...

Tiny zircon crystals are revealing that Earth’s earliest history may have included surprisingly complex tectonic activity.

The discovery that amino acids can form in more ways than we thought is another boost to the search for life beyond Earth. If ...

New tools unlock new discoveries in science. So when a new type of non-destructive technology becomes widely available, it's inevitable that planetary scientists will get their hands on it to test it ...

Parts of the ancient Earth may have formed continents and recycled crust through subduction far earlier than previously thought. New research led by scientists at the University of Wisconsin–Madison ...

Scientists believe these rocks were formed by ancient rainfall and humidity, similar to processes on Earth. The discovery adds to the evidence that Mars may have once been a habitable planet capable ...