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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 Northwest Africa 7325 ： ウィキペディア英語版 Northwest Africa 7325 Northwest Africa 7325, also known as NWA 7325 is the first meteorite believed to have originated from Mercury. Found in a marketplace in Erfoud, Morocco in April 2012,〔(Northwest Africa 7325 ). ''Meteoritical Bulletin Database''. Lunar and Planetary Institute, Houston, Texas. Accessed 2013-03-30.〕 the meteorite is composed of 35 fragments with a combined weight of approximately .〔Major, Jason. March 29, 2013. "(Greenish rock may be meteorite from Mercury )". ''NBC News''. New York. Accessed 2013-03-30.〕 Investigation of the meteorite by Anthony Irving at the University of Washington determined that the meteorite's composition is consistent with that of Mercury as determined by the MESSENGER spacecraft.〔 Irving cautioned, however, that NWA 7325 could also have come from a smaller but Mercury-like body;〔Kramer, Miriam. March 29, 2013. "(Green Meteorite May Be from Mercury, a First )". ''Yahoo! News''. Accessed 2013-03-30.〕 an alternative explanation offered is that NWA 7325 may be a primitive achondrite. Notable for its green fusion crust and high-magnesium/low-iron composition, NWA 7325 is estimated to be 4.56 billion years old and was likely ejected from Mercury on an Earth-intersecting trajectory by an impact.〔 ==References== 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「Northwest Africa 7325」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.