New theory suggests large blobs of material in Earth's mantle are remnants of protoplanet Theia

A team of scientists at Arizona State University has proposed that the large blobs of material in Earth's mantle (the large low-shear velocity provinces, LLSVPs) may be left over pieces of Theia, a protoplanet theorized to have struck Earth, resulting in the creation of the moon. The group argued their case at this year's Lunar and Planetary Science Conference and are awaiting publication in Geophysical Research Letters.