An impact with a protoplanet called Theia 4.5 billion years ago seems to have left remnants deep inside Earth For decades, scientists have been baffled by two large, mysterious blobs in Earth’s mantle ...

Deep inside Earth, far below the crust and mantle we learn about in school, two colossal structures loom above the core like buried continents. New research argues these dense, mysterious formations ...

Debris from the impact between Earth and the protoplanet eventually formed the moon. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The newborn ...

The big picture: Theia is a hypothetical ancient planet that orbited the Sun during the formation of the solar system. According to the giant-impact hypothesis, this protoplanet collided with Earth ...

Relics of an ancient planet might be hiding under our feet, according to new research. Some scientists believe that a “protoplanet” named Theia collided with Earth some 4.5 billion years ago. That ...

PASADENA, Calif. — Continent-sized remnants of another world could be found deep inside the Earth, according to a new study coming out of California. Researchers believe the remnants could be pieces ...