Discover how scientists have used iron isotopes to determine the likely origin of the Mars-sized planet named Theia.

About 4.5 billion years ago, the most momentous event in the history of Earth occurred: a huge celestial body called Theia ...

"The most convincing scenario is that most of the building blocks of Earth and Theia originated in the inner solar system.

Theia' is a long-vanished world, a planet-sized body thought to have smashed into the early Earth and that helped to form the ...

Theia, the world that helped form the Moon, came from the Solar System. Chemical clues in Earth and Moon rocks reveal this ...

The lack of clarity regarding the collision and the object that Earth collided with raised many questions, but they were ...

According to researchers, the composition of a planet or celestial body holds the entire story of its formation and origin.

New research suggests that Theia, the object whose collision with Earth is theorized to have caused the formation of the moon ...

Roughly four and a half billion years ago the planet Theia slammed into Earth, destroying Theia, melting large fractions of ...

To our best of our understanding, the Moon formed from Earth following a colossal impact. A Mars-sized world we nicknamed ...

About 4.5 billion years ago, a colossal impact between the young Earth and a mysterious planetary body called Theia changed everything—reshaping Earth, forming the Moon, and scattering clues across ...

In the current issue of the journal Science, researchers determine the possible composition of Theia. The impactor’s ...