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 ...

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

A tiny sample of the Moon locked away for more than 50 years turns out to have been hiding an astronomical secret.

Atoms found deep inside our planet argue that parts of “proto-Earth,” the early version of our planet, still survive inside ...

Scientists believe the moon was formed from the debris of a collision between Earth and the planet Theia, which was likely ...

Scientists believe the moon was formed from the debris of a collision between Earth and the planet Theia, which was likely located closer to the sun than Earth is now.

One fateful day about 4.5 billion years ago, a Mars-sized body called Theia collided with proto-Earth, turning both into a ...

New research reveals the origin of the Moon! Scientists say Earth and its cosmic neighbor Theia were close neighbors before a massive collision. This cataclysmic impact between Theia and Earth ...

They went through the isotope mixtures in Earth and lunar rocks instead of using highly technical models. They dabbled in ...

According to the leading theory of how the Earth-Moon system formed (the Giant Impact Hypothesis), a Mars-sized object (named ...

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

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