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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 Tombaugh (Martian crater) ： ウィキペディア英語版 Tombaugh (Martian crater) Tombaugh Crater is an impact crater in the Elysium quadrangle of Mars, located at 3.5°N latitude and 198.2°W longitude. It is 60.3  km in diameter and was named after Clyde Tombaugh, American astronomer (1906–1997), and the name was approved in 2006 by the International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN). Wikitombaughwest.jpg|West side of Tombaugh (Martian crater), as seen by CTX camera (on Mars Reconnaissance Orbiter). ==Why craters are important== The density of impact craters is used to determine the surface ages of Mars and other solar system bodies.〔http://www.lpi.usra.edu/publications/slidesets/stones/〕 The older the surface, the more craters present. Crater shapes can reveal the presence of ground ice. 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「Tombaugh (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.