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

New research suggests Earth's Moon formed from the catastrophic collision of our planet with its \"sister\" planet, Theia, ...

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

About 4.5 billion years ago, Earth had a violent neighbor. A young, still-forming planet named Theia slammed into our world with enough force to melt vast portions of its mantle and scatter a huge ...

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 ...

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

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 ...

Scientists traced the Moon's parent planet Theia to the inner Solar System, solving a 4.5-billion-year mystery.

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