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A critical difference is that a structural water absorption of hydrous silicates is around twice as deep in the returned samples compared with those of Ryugu’s surface, suggesting Ryugu surface is more dehydrated. Here we use laboratory experiments data to indicate the spectral differences between returned samples and asteroid surface are best explained if Ryugu surface has (1) higher porosity, (2) larger particle size, and (3) more space-weathered condition, with the last being the most effective. On Ryugu, space weathering by micrometeoroid bombardments promoting dehydration seem to be more effective than that by solar-wind implantation. Extremely homogeneous spectra of the Ryugu’s global surface is in contrast with the heterogeneous S-type asteroid (25143) Itokawa’s spectra, which suggests space weathering has proceeded more rapidly on Cb-type asteroids than S-type asteroids.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021390744448142","@type":"Researcher","foaf:name":[{"@value":"Moe Matsuoka"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390744448278","@type":"Researcher","foaf:name":[{"@value":"Ei-ichi Kagawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390744448150","@type":"Researcher","foaf:name":[{"@value":"Kana 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