Theia

How the Moon's mantle may have formed after the proto-planet Theia smashed into Earth

Hidden Depths: Uncovering Theia’s Mysterious Remnants Inside Earth

Scientists think they’ve found remnants of Theia within the Earth's mantle

Bits of an ancient planet called Theia may be buried in Earth’s mantle

The remnants of an ancient planet might be buried inside Earth. New research suggests the Moon-forming Theia impactor (a Mars-size body that struck Earth 4.5 billion years ago) might have merged with our planet, forming two dense clumps in Earth's mantel that still exist to this day.