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"Hayabusa2" team elucidates the origin and evolution of the asteroid Ryugu.

Collaborative research teams such as Okayama University, Nagoya City University, and Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency have announced that they recovered 16 particles from the asteroid Ryugu. 

Which was the target of the exploration of the Japanese asteroid explorer "Hayabusa 2", will be used. 

A detailed, comprehensive geochemical analysis was carried out. As a result, it was found that the asteroid material sample holds evidence of the complicated physicochemical process from before the formation of the solar system to the present, leading to a new picture of the evolution of the solar system material, including the origin of life.

The research team chemically analyzed 16 particles (total volume of 55 mg) of the samples collected by Hayabusa2 from the vicinity of the surface layer at two-touchdown points on Ryugu. It concentrated an isotope composition of up to 70 elements for each particle. 

It analyzes micron-sized organic matter with characteristic isotopic composition. 

Organic and inorganic substances of different origins before the solar system's formation, such as the interstellar medium and the precursor of the solar system, which were the source of the solar system, were confirmed in the Ryugu sample.

According to the results of this analysis, Ryugu was born as an ice object (planetesimal) with a size of several tens of kilometers at the outer edge of the solar system, originating from the interstellar medium and solar system precursors. Up to about 2.6 million years after the solar system's formation, it was crushed by water quality alteration. 

It formed a comet nucleus with a size of several kilometers. After that, it reached a near-Earth orbit as a comet-like asteroid, and it seems that it evolved into a crushed aggregate-like asteroid with the sublimation of ice.


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