A detailed simulation of Theia crashing into Earth. While the collision was violent, it was not energetic enough to melt the Earth's lower mantle -- meaning that remnants of Theia could be preserved, ...

Earth didn't exactly start out ready to support life, but scientists now have a better idea of how the essential elements for life ended up on our planet, according to a study published Wednesday in ...

Most scientists agree that a major collision 4.5 billion years ago with a protoplanet named Theia formed the Earth-Moon system. Now, a new study from the University of Nevada argues that, out of the ...

A Mars-size object called Theia smashed into Earth, and the debris coalesced into the moon. Now scientists believe they may have identified pieces of Theia at the bottom of Earth’s mantle. A new study ...

The Moon formed in a catastrophic impact between the proto-Earth (Gaia) and a Mars-sized object we call Theia. The collision happened around 4.5 billion years ago but its effects are still with us.