Rocks on Earth (and the Moon) are distinguished by being on a specific line on the oxygen isotope plot, the SMOW (Standard Mean Ocean Water) line. This may reflect a large, homogenizing event in the early history of the Earth (like a giant impact that formed the Moon).
The realization that meteorites come from multiple different parent bodies is that they are distributed widely, not all on one line on this plot. Bennu, like primitive meteorites, appears to be off the terrestrial line.
Comments
Rocks on Earth (and the Moon) are distinguished by being on a specific line on the oxygen isotope plot, the SMOW (Standard Mean Ocean Water) line. This may reflect a large, homogenizing event in the early history of the Earth (like a giant impact that formed the Moon).
The realization that meteorites come from multiple different parent bodies is that they are distributed widely, not all on one line on this plot. Bennu, like primitive meteorites, appears to be off the terrestrial line.
https://ntrs.nasa.gov/api/citations/20240000340/downloads/Fr...