A detailed simulation of Theia crashing into Earth. While the collision was violent, it was not energetic enough to melt the Earth's lower mantle -- meaning that remnants of Theia could be preserved, ...
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 ...