Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
National Institute for Environmental Studies (NIES)
University of Aizu
University of Aizu
Chiba Institute of Technology
National Institute for Environmental Studies (NIES)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
出版者
宇宙航空研究開発機構宇宙科学研究本部
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)
雑誌名
Proceedings of the ISAS lunar and planetary symposium
巻
41
ページ
77 - 80
発行年
2009
会議概要（会議名, 開催地, 会期, 主催者等）（英）
The 41st ISAS Lunar and Planetary Symposium (August 6-8, 2008. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA))
抄録（英）
A large impact in the Earth-Moon system is estimated to occur once in millions of years. However, there is a hypothesis that the Giordano Bruno crater, the youngest lunar crater of its size (22 km) or larger, was formed in AD 1178 based on a medieval record describing an extreme lunar sparkling phenomenon. Such an impact on the Earth would be "civilization threatening". The Giordano Bruno formation impact is often referred as the only candidate of a large and recent impact that occurred in the Earth-Moon system. However, the absolute age of the formation of Giordano Bruno remains unknown. Here we present conclusive evidence against the hypothesis; a number of small craters (< 200 m in diameter) are found on the continuous ejecta of Giordano Bruno. Based on the number density of the small craters, the formation age of Giordano Bruno is estimated as far more than 800 years ago, 1 to 10 Ma. No large impacts have ever occurred in the Earth-Moon system during human history.
内容記述（英）
Physical characteristics: Original contains color illustrations
Age determination of the 22-km-diameter lunar crater Giordano Bruno
