Nature Astronomy, Published online: 05 October 2023; doi:10.1038/s41550-023-02092-9

A statistical study of the ~2.7 µm hydration band in the Ryugu samples shows that Ryugu’s immediate subsurface has not been exposed to space weathering and that even the pristine CI chondrites exhibit terrestrial contamination, making the Hayabusa2 samples a reference for primitive water abundance in carbonaceous asteroids.

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