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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 13496naa a2201441 4500 | |
| 001 | oai:DiVA.org:ltu-85047 | |
| 003 | SwePub | |
| 008 | 210607s2021 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-850472 URI |
| 024 | 7 | a https://doi.org/10.1038/s41550-021-01371-72 DOI |
| 040 | a (SwePub)ltu | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Sakatani, N.u Department of Physics, Rikkyo University, Toshima, Japan4 aut |
| 245 | 1 0 | a Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body |
| 264 | c 2021-05-24 | |
| 264 | 1 | b Springer Nature,c 2021 |
| 338 | a print2 rdacarrier | |
| 500 | a Validerad;2021;Nivå 2;2021-08-17 (johcin) | |
| 520 | a Planetesimals—the initial stage of the planetary formation process—are considered to be initially very porous aggregates of dusts1,2, and subsequent thermal and compaction processes reduce their porosity3. The Hayabusa2 spacecraft found that boulders on the surface of asteroid (162173) Ryugu have an average porosity of 30–50% (refs. 4,5,6), higher than meteorites but lower than cometary nuclei7, which are considered to be remnants of the original planetesimals8. Here, using high-resolution thermal and optical imaging of Ryugu’s surface, we discovered, on the floor of fresh small craters (<20 m in diameter), boulders with reflectance (~0.015) lower than the Ryugu average6 and porosity >70%, which is as high as in cometary bodies. The artificial crater formed by Hayabusa2’s impact experiment9 is similar to these craters in size but does not have such high-porosity boulders. Thus, we argue that the observed high porosity is intrinsic and not created by subsequent impact comminution and/or cracking. We propose that these boulders are the least processed material on Ryugu and represent remnants of porous planetesimals that did not undergo a high degree of heating and compaction3. Our multi-instrumental analysis suggests that fragments of the highly porous boulders are mixed within the surface regolith globally, implying that they might be captured within collected samples by touch-down operations10,11. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
| 653 | a Atmosfärsvetenskap | |
| 653 | a Atmospheric Science | |
| 700 | 1 | a Tanaka, S.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; University of Tokyo, Kashiwa, Japan4 aut |
| 700 | 1 | a Okada, T.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; University of Tokyo, Bunkyo, Japan4 aut |
| 700 | 1 | a Fukuhara, T.u Department of Physics, Rikkyo University, Toshima, Japan4 aut |
| 700 | 1 | a Riu, L.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Sugita, S.u University of Tokyo, Bunkyo, Japan4 aut |
| 700 | 1 | a Honda, R.u Kochi University, Kochi, Japan4 aut |
| 700 | 1 | a Morota, T.u University of Tokyo, Bunkyo, Japan4 aut |
| 700 | 1 | a Kameda, S.u Department of Physics, Rikkyo University, Toshima, Japan4 aut |
| 700 | 1 | a Yokota, Y.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Tatsumi, E.u University of Tokyo, Bunkyo, Japan; Instituto de Astrofisica de Canarias, University of La Laguna, La Laguna, Spain4 aut |
| 700 | 1 | a Yumoto, K.u University of Tokyo, Bunkyo, Japan4 aut |
| 700 | 1 | a Hirata, N.u University of Aizu, Aizu-Wakamatsu, Japan4 aut |
| 700 | 1 | a Miura, A.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Kouyama, T.u National Institute of Advanced Industrial Science and Technology, Koto, Japan4 aut |
| 700 | 1 | a Senshu, H.u Chiba Institute of Technology, Narashino, Japan4 aut |
| 700 | 1 | a Shimaki, Y.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Arai, T.u Ashikaga University, Ashikaga, Japan4 aut |
| 700 | 1 | a Takita, J.u Hokkaido Kitami Hokuto High School, Kitami, Japan4 aut |
| 700 | 1 | a Demura, H.u University of Aizu, Aizu-Wakamatsu, Japan4 aut |
| 700 | 1 | a Sekiguchi, T.u Hokkaido University of Education, Asahikawa, Japan4 aut |
| 700 | 1 | a Müller, T.G.u Max-Planck Institute for Extraterrestrial Physics, Garching, Germany4 aut |
| 700 | 1 | a Hagermann, Axelu Luleå tekniska universitet,Rymdteknik4 aut0 (Swepub:ltu)axehag |
| 700 | 1 | a Biele, J.u German Aerospace Center (DLR), Cologne, Germany4 aut |
| 700 | 1 | a Grott, M.u German Aerospace Center (DLR), Berlin, Germany4 aut |
| 700 | 1 | a Hamm, M.u German Aerospace Center (DLR), Berlin, Germany; University of Potsdam, Potsdam, Germany4 aut |
| 700 | 1 | a Delbo, M.u Observatoire de la Côte d’Azur, CNRS, Nice, France4 aut |
| 700 | 1 | a Neumann, W.u German Aerospace Center (DLR), Berlin, Germany; Universität Heidelberg, Heidelberg, Germany4 aut |
| 700 | 1 | a Taguchi, M.u Department of Physics, Rikkyo University, Toshima, Japan4 aut |
| 700 | 1 | a Ogawa, Y.u University of Aizu, Aizu-Wakamatsu, Japan4 aut |
| 700 | 1 | a Matsunaga, T.u National Institute for Environmental Studies, Tsukuba, Japan4 aut |
| 700 | 1 | a Wada, T.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Hasegawa, S.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Helbert, J.u German Aerospace Center (DLR), Berlin, Germany4 aut |
| 700 | 1 | a Hirata, N.u Kobe University, Kobe, Japan4 aut |
| 700 | 1 | a Noguchi, R.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Yamada, M.u Chiba Institute of Technology, Narashino, Japan4 aut |
| 700 | 1 | a Suzuki, H.u Meiji University, Kawasaki, Japan4 aut |
| 700 | 1 | a Honda, C.u University of Aizu, Aizu-Wakamatsu, Japan4 aut |
| 700 | 1 | a Ogawa, K.u JAXA Space Exploration Center, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Hayakawa, M.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Yoshioka, K.u University of Tokyo, Kashiwa, Japan4 aut |
| 700 | 1 | a Matsuoka, M.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Cho, Y.u University of Tokyo, Bunkyo, Japan4 aut |
| 700 | 1 | a Sawada, H.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Kitazato, K.u University of Aizu, Aizu-Wakamatsu, Japan4 aut |
| 700 | 1 | a Iwata, T.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan4 aut |
| 700 | 1 | a Abe, M.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Ohtake, M.u University of Aizu, Aizu-Wakamatsu, Japan4 aut |
| 700 | 1 | a Matsuura, S.u Kwansei Gakuin University, Hyogo, Japan4 aut |
| 700 | 1 | a Matsumoto, K.u The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; National Astronomical Observatory of Japan, Mitaka, Japan4 aut |
| 700 | 1 | a Noda, H.u The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; National Astronomical Observatory of Japan, Mitaka, Japan4 aut |
| 700 | 1 | a Ishihara, Y.u JAXA Space Exploration Center, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Yamamoto, K.u National Astronomical Observatory of Japan, Mitaka, Japan4 aut |
| 700 | 1 | a Higuchi, A.u University of Occupational and Environmental Health, Kitakyusyu, Japan4 aut |
| 700 | 1 | a Namiki, N.u The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; National Astronomical Observatory of Japan, Mitaka, Japan4 aut |
| 700 | 1 | a Ono, G.u Research and Development Directorate, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Saiki, T.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Imamura, H.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Takagi, Y.u Aichi Toho University, Nagoya, Japan4 aut |
| 700 | 1 | a Yano, H.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan4 aut |
| 700 | 1 | a Shirai, K.u Kobe University, Kobe, Japan4 aut |
| 700 | 1 | a Okamoto, C.u Kobe University, Kobe, Japan4 aut |
| 700 | 1 | a Nakazawa, S.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Iijima, Y.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Arakawa, M.u Kobe University, Kobe, Japan4 aut |
| 700 | 1 | a Wada, K.u Chiba Institute of Technology, Narashino, Japan4 aut |
| 700 | 1 | a Kadono, T.u University of Occupational and Environmental Health, Kitakyusyu, Japan4 aut |
| 700 | 1 | a Ishibashi, K.u Chiba Institute of Technology, Narashino, Japan4 aut |
| 700 | 1 | a Terui, F.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Kikuchi, S.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Yamaguchi, T.u Mitsubishi Electric Corporation, Kamakura, Japan4 aut |
| 700 | 1 | a Ogawa, N.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Mimasu, Y.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Yoshikawa, K.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Takahashi, T.u NEC Corporation, Fuchu, Japan4 aut |
| 700 | 1 | a Takei, Y.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Fujii, A.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Takeuchi, H.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan4 aut |
| 700 | 1 | a Yamamoto, Y.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Hirose, C.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Hosoda, S.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Mori, O.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Shimada, T.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Soldini, S.u University of Liverpool, Liverpool, UK4 aut |
| 700 | 1 | a Tsukizaki, R.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Ozaki, M.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan4 aut |
| 700 | 1 | a Tachibana, S.u University of Tokyo, Bunkyo, Japan4 aut |
| 700 | 1 | a Ikeda, H.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan4 aut |
| 700 | 1 | a Ishiguro, M.u Seoul National University, Seoul, Korea4 aut |
| 700 | 1 | a Yabuta, H.u Hiroshima University, Higashi-hiroshima, Japan4 aut |
| 700 | 1 | a Yoshikawa, M.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan4 aut |
| 700 | 1 | a Watanabe, S.u Nagoya University, Nagoya, Japan4 aut |
| 700 | 1 | a Tsuda, Y.u Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan4 aut |
| 710 | 2 | a Department of Physics, Rikkyo University, Toshima, Japanb Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; University of Tokyo, Kashiwa, Japan4 org |
| 773 | 0 | t Nature Astronomyd : Springer Natureg 5:8, s. 766-774q 5:8<766-774x 2397-3366 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85047 |
| 856 | 4 8 | u https://doi.org/10.1038/s41550-021-01371-7 |
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