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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Denning (Martian crater) ： ウィキペディア英語版 Denning (Martian crater) Denning Crater is a crater in the Sinus Sabaeus quadrangle of Mars at 17.7° south latitude and 326.6° west longitude. It is about 165 km in diameter and was named after William F. Denning, a British astronomer (1848–1931). == Craters == When a comet or asteroid collides at a high rate of speed interplanetary with the surface of Mars it creates a primary impact crater. The primary impact may also eject significant numbers of rocks which eventually fall back to make secondary craters. The secondary craters may be in clusters. All of the craters in the cluster would appear to be equally eroded; hence they would all seem to be of the same age. If these secondary craters formed from a single, large, nearby impact, then they would have formed at roughly the same instant in time. The image below of Dennin Crater shows a cluster of secondary craters. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Denning (Martian crater)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.