Scientists have uncovered a surprising discovery within lunar rocks collected over five decades ago. A tiny sample of the ...

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 the mantle.

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 ...

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

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

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

This collision was responsible for more than just creating the moon — it also affected the shape, mass and composition of the Earth. However, new research from the journal Scien ...