Is the moon a chunk ejected from Earth? Study sheds light on moon formation, origin of water on Earth

A research team from the University of Göttingen and the Max Planck Institute for Solar System Research (MPS) has discovered another piece in the puzzle of the formation of the moon and water on Earth. The prevailing theory had been that the moon was the result of a collision between early Earth and the protoplanet Theia. New measurements indicate that the moon formed from material ejected from the Earth's mantle with little contribution from Theia.