Two perplexing structures deep inside Earth might be ancient remnants of our early planet, and they could hold clues about ...

One of the most elegant theories about the origins of life on our planet is that it was kick-started by a delivery from outer ...

An international team has made a significant breakthrough in understanding the tectonic evolution of terrestrial planets.

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

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

Little is known about the long-destroyed moon-forming planet, Theia. But it may have been born in the inner solar system—just like Earth—a new study suggests ...

In the darkest corners of the planet, where the light of the Sun never touches, eerie glows can yet be found, illuminating ...

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, 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 ...

"During the early solar system's game of cosmic billiards, Earth was struck by a neighbor,” said Dauphas. “It was a lucky shot. Without the moon's steadying influence on our planet's tilt, the climate ...

A new study reveals that the asteroid 2024 PT5, which has been orbiting Earth for 2 months, may have a "lunar origin." However, it is about to break free from our planet, making it tricky to tell for ...