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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 Willamette Meteorite ： ウィキペディア英語版 Willamette Meteorite The Willamette Meteorite, officially named Willamette,〔(Meteoritical Bulletin Database: Willamette. ) The Meteoritical Society. Retrieved on August 16, 2008.〕 is an iron-nickel meteorite discovered in the U.S. state of Oregon. It is the largest meteorite found in North America and the sixth largest in the world.〔O. Richard Norton. ''Rocks from Space''. USA, Mountain Press, 1994.〕〔(【引用サイトリンク】title= Cullman Hall of the Universe: The Willamette Meteorite )〕 There was no impact crater at the discovery site; researchers believe the meteorite landed in what is now Canada or Montana, and was transported as a glacial erratic to the Willamette Valley during the Missoula Floods at the end of the last Ice Age (~13,000 years ago). It was long held sacred by indigenous peoples of the Willamette Valley, including the federally recognized Confederated Tribes of the Grand Ronde Community of Oregon (CTGRC). The indigenous peoples referred to this stone with the name ''Tomonowos'' (the visitor from the sky). The meteorite is currently on display at the American Museum of Natural History, which acquired it in 1906.〔() The American Museum of Natural History Website. Retrieved on November 28th, 2010.〕 Having been seen by an estimated 40 million people over the years, and given its striking appearance, it is among the most famous meteorites known.〔(Science Channel's "Top Ten Meteorites" ). Retrieved on November 29th, 2010.〕 In 2005 the Confederate Tribes sued to have the meteorite returned to their control but they were unsuccessful.〔 ==Physical characteristics and formation== The Willamette Meteorite weighs about . It is classified as a type III iron meteorite, being composed of over 91% iron and 7.62% nickel, with traces of cobalt and phosphorus. The approximate dimensions of the meteorite are tall by wide by deep. Most iron meteorites like Willamette have originated from the differentiated core of planetesimals or asteroids that collided with another object. Willamette has a recrystallized structure with only traces of a medium Widmanstätten pattern; it is the result of a significant impact-heating event on the parent body.〔〔^ Vagn F. Buchwald: Handbook of Iron Meteorites, University of California Press 1975.〕 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「Willamette Meteorite」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.