Hayabusa2’s optical navigation camera (ONC) found many anomalously bright boulders on the dark surface of the carbonaceous (or C-type) asteroid Ryugu. Observations with ONC and the near-infrared spectrometer (NIRS3) indicates that at least six of those bright boulders exhibit reflectance spectra consistent with exogenous origin; their spectra are similar to rocky (or S-type) asteroids. This means that the bright boulders resulted from collisional mixing between Ryugu’s parent body and S-type asteroid(s). On Bennu, the asteroid explored by NASA’s OSIRIS-REx, bright boulders with spectra
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