Japanese scientists have completed the analysis of the grains of the asteroid Ryugu. Tohoku University reports .
Ryugu is a near-Earth asteroid with a diameter of about 900 meters. He is famous for the fact that in 2019 he was visited by the Japanese probe Hayabusa-2 and took soil samples. The material delivered to Earth has become a valuable source of information on the composition and structure of asteroids.
A new study of rock samples brought back to Earth has focused on chondro-like elements and inclusions (CAIs) rich in calcium and aluminium. For example, some asteroids of the Main Belt, which periodically fall to the Earth, consist of such material.
Many researchers have previously concluded that the asteroid Ryugu (now near-Earth) could have formed in the outer solar system. The main conclusion of the new work is that CAI material could have originated in the inner solar system at the dawn of its existence, and then gradually transferred to the outer parts. Scientists came to such conclusions as a result of an analysis of the isotopic composition, which indicates proximity to the Sun, as well as an analysis of the structure of grains under a microscope.
According to the authors of the work, CAI and other material formed a certain body in the outer solar system, during the split of which Ryugu was formed, which then migrated to the Earth. “Now we want to analyze more of these oldest Ryugu solar system solid materials to try to understand the mechanisms of radial outward transport in the early solar nebula,” the authors explain.