Formation of the moon brought water to Earth

The molybdenum isotopes allow us to clearly distinguish carbonaceous and non-carbonaceous material, and as such represent a ‘genetic fingerprint’ of material from the outer and inner solar system,” explains Dr. Gerrit Budde of the Institute of Planetology in Münster and lead author of the study. The measurements made by the researchers from Münster show that the molybdenum isotopic composition of the Earth lies between those of the carbonaceous and non-carbonaceous meteorites, demonstrating that some of Earth’s molybdenum originated in the outer solar system. Budde et al, Molybdenum isotopic evidence for the late accretion of outer Solar System material to Earth,
Nature Astronomy (2019).

Source: phys.org