what happened to Theia
the journal of Michael Werneburg
twenty-seven years and one million words
Kokubunji, 2023.12.06
I do like a rotating model, and this news item prominently features one! It shows our ongoing research into 1) what happened to "Theia", the small planet that collided with the Earth some 4-5 billion years ago, and 2) why isn't Earth's mantle a sphere. The answer: that small planet was partially absorbed by the Earth (some part of proto-Earth and the smaller planet became the moon).
image sourced from linked article