Nakamura et al. (2012) Author summary of Space environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft, Proceedings of the National Academy of Sciences of the United Sates of America, 109, 4031-4032, doi:10.1073/pnas.1116236109.. < 20200609141529-231682 > pub
  • abstract:

    Asteroids are intermediate products of the growth of planetary bodies. Similar to what is observed on the Moon, the surfaces of airless bodies such as asteroids retain accumulated histories of solid-to-solid interactions. Meteorites that fall to Earth are fragments of asteroids; however, their entry into Earth’s atmosphere erases much of the evidence for the processes affecting their surfaces in space. For this reason, observations of the surfaces of low-gravity celestial bodies have been limited to those made remotely. In this study, we examined microscopic grains collected from the outermost surface of an asteroid called Itokawa and returned to Earth by the Hayabusa spacecraft. A nanometer-scale study of these grains in our laboratory provides a glimpse of the asteroid surface that is physically and chemically modified by repeated high-velocity collisions with micrometeorites, or tiny meteorites that enter Earth’s atmosphere.

  • doi: 10.1073/pnas.1116236109.
  • modified at 2020-06-09
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  • name
  • Nakamura, Eizo
  • Makishima, Akio
  • Moriguti, Takuya
  • Kobayashi, Katsura
  • Tanaka, Ryoji
  • Kunihiro, Tak
  • Tsujimori, Tatsuki
  • Sakaguchi, Chie
  • Kitagawa, Hiroshi
  • Ota, Tsutomu
  • Yachi, Yusuke
  • Yada, Toru
  • Abe, Masanao
  • Fujimura, Akio
  • Ueno, Munetaka
  • Mukai, Toshifumi
  • Yoshikawa, Makoto
  • Kawaguchi, Jun'ichiro