Theia

With the help of state-of-the-art supercomputers, we're getting a whole lot closer to unraveling the mystery behind the formation of the Moon.

Moon Sims

That hurts to watch.

Brutal Video Simulates When Earth Hit Another Planet Many Years Ago

The gigantic blobs buried within the Earth's mantle, thought to be fragments of the ancient protoplanet Theia, are unfathomably huge.

New Climbing Goal

An ancient collision may have left giant chunks of another world buried beneath our feet.

Pieces of Alien Planet Buried Inside Earth Are "Millions of Times Larger Than Mount Everest"

A study suggests that the mysterious, giant blobs hidden in the Earth's mantle might be the remains of a protoplanet that crashed billions of years ago.

Planetary Burial

Theia's impact with the Earth created the Moon — and perhaps left some shrapnel behind.

There Appears to Be a Huge Chunk of an Ancient Planet Buried Inside Earth

Researchers from the University of New Mexico believe they have found the remains of Theia buried deep beneath the lunar surface in a new paper.

Theia is Alive

Did a Mars-sized object smash into the Earth billions of years ago?

Fragment of Planet That Hit Earth May Be Buried Inside Moon

A new study suggests that the Moon formed after a Mars-sized object known as Theia slammed into a magma-covered young Earth.