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Researchers May Have Discovered 2 Theia Remains Inside The Earth’s Mantle. Theia Is Said To Have Collided With Earth 4.5 Byr Ago, Knocking Off The Rock That Formed The Moon. Theia Remains, Supported By Isotopic Evidence And Modeling, Are Said To Be In The Large Low-Shear Velocity Provinces, Probably Beneath W. Africa And The Pacific Ocean.

Alien Planet Theia Buried Inside Earth Found by Scientists | Observer

https://observer.com/2021/03/planet-theia-remnants-in-earth-mantle-science-study/

Pieces of the planet may also exist in the moon.