Two continent-sized structures deep inside Earth may contain remnants of Theia, the ancient planet thought to have collided ...

Earth’s story may have hardened into place almost as soon as the Solar System began. That is the striking claim in new research tracing when the young planet locked in the chemical makeup that still ...

About 4.5 billion years ago, the most momentous event in the history of Earth occurred: a huge celestial body called Theia collided with the young Earth. How the collision unfolded and what exactly ...

There are two enormous provinces of unusual rock that sit at the bottom of the mantle, just above the Earth's core. One of them is located underneath Africa and one is under the Pacific Ocean. They're ...