Ancient grains of dust are revealing the life story of a Solar System asteroid.
The researchers say these results suggest that the primary parent body of Ryugu was a planetesimal – the"seed" that could grow into a planet – that initially formed in the outer Solar System, incorporating outer Solar System ingredients. However, something disrupted its growth, perhaps breaking it apart, and sent it to the Main Belt, where it was altered by water and transformed., the researchers say.
"Ryugu-returned samples are one of the keys to access the source of asteroid spectral diversity because their more pristine lithologies contain anhydrous grains which are spectrally similar to some outer solar system primitive bodies,""This suggests that Ryugu contains potentially several reservoirs of anhydrous primitive dust, which carry valuable information on the formation and evolution of planetesimals in the protoplanetary disk.
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