https://www.livescience.com/theia-may-be-in-mysterious-mantle-blobs.html
Scientists say that remnants of the protoplanet Theia, which once crashed into Earth, can still be found deep inside our planet.
remnantprotoplanetmayhidinginside
https://www.space.com/15630-asteroid-vesta-protoplanet-dawn-spacecraft.html
New observations from NASA's Dawn spacecraft confirm that the huge asteroid Vesta is a protoplanet left over from the solar system's early days.
asteroid vestahugeactuallyancientprotoplanet