Our goal is to describe atoms that represent element distribution of the Solar system that are continuously evolving from the beginning to the future. To understand the Solar system with spatial scale 1013 m, we analyze planetary materials that are from different origin with different processes, and determine element and isotope compositions with spatial resolution down to 10-9 m.

Planetary materials besides terrestrial ones are the rolling stones that are sampled with locality unknown. To fill the important missing information, we developed a protocol that is to determine multiple-elements, multiple-isotopes, and multiple-phases. We referred the approach to be 'comprehensive' and construct an analytical system that let us do so. The system acts as a gigantic machine with numerous instruments glued by analytical methods and disciplined people. The disciplines and samples would be taken over to the next generation to sustain our science.

We work as a team and prefer arguments scientifically.


Insights into the formation and evolution of extraterrestrial amino acids from the asteroid Ryugu


The amino acid abundances of two Ryugu particles were measured and compared with their rocky components. The results demonstrate the important role that water plays in the formation of amino acids on the giant precursors of asteroids like Ryugu.

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On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective


A team of scientists undertake a comprehensive analysis of samples returned from the Japan Aerospace Exploration Agency’s Hayabusa2 mission and provide invaluable insights into the formation and evolution of our solar system.

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Christian Potiszil, Tsutomu Ota, Masahiro Yamanaka, Chie Sakaguchi, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Hiroshi Kitagawa, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa and Eizo Nakamura. Insights into the formation and evolution of extraterrestrial amino acids from the asteroid Ryugu, Nat Commun. 14, 1482 (2023).

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N. Kucukarslan, T. Ota, K. Kobayashi, E. Nakamura, and S. Omura. Early Efforts to Smelt Iron in Central Anatolia: Analysis of Iron Artefacts from the Bronze Age in Kaman-Kalehöyük, Microstruct. Anal., (2023).

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Matthew P. Nikitczuk, Gray E. Bebout, Charles A. Geiger, Tsutomu Ota, Takuya Kunihiro, John F. Mustard, Sæmundur A. Halldórsson, and Eizo Nakamura. Nitrogen Incorporation in Potassic and Micro- and Meso-Porous Minerals: Potential Biogeochemical Records and Targets for Mars Sampling, Astrobiology, 22, 1-17 (2022).

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March 15, 16:00 AM in 3F Seminar Room
Seminar by Prof. Gray Bebout (Lehigh University)

March 7, 10:00 AM in 3F Seminar Room
Seminar by Dilan M. Ratnayake

December 13, 10:00 AM in 3F Seminar Room
Seminar by Noah Miklusicak

September 27, 10:00 AM in 3F Seminar Room
Seminar by Rahul Kumar

September 6, 10:00 AM in 3F Seminar Room
Seminar by Havishk Tripathi

August 23, 10:00 AM in 3F Seminar Room
Seminar by Koya Kobayashi (D1, Graduate School of Life and Environmental Sciences, Tsukuba University)

August 19, 16:00-17:00 in 3F Seminar Room
PhD defense presentation by Maya-Liliana Avramescu