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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 I Zwicky 18 ： ウィキペディア英語版 I Zwicky 18 I Zwicky 18 is a dwarf irregular galaxy located about 59 million light years away〔(【引用サイトリンク】work=HubbleSite NewsCenter )〕 in the constellation Ursa Major. The galaxy was first identified by Swiss astronomer Fritz Zwicky in a 1930s photographic survey of galaxies.〔 〕 ==Age== Studies at the Palomar Observatory some 40 years ago led astronomers to believe that the galaxy erupted with star formation billions of years after its galactic neighbors. Galaxies resembling I Zwicky 18's youthful appearance are typically found only in the early universe. Early observations with the Hubble Space Telescope suggested an age of 500 million years old for I Zwicky 18.〔 (【引用サイトリンク】url=http://hubblesite.org/newscenter/newsdesk/archive/releases/2004/35/text/ )〕 The Hubble Space Telescope, however, later found faint, older stars contained within the galaxy, suggesting its star formation started at least one billion years ago and possibly as much as ten billion years ago. The galaxy, therefore, may have formed at the same time as most other galaxies. 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「I Zwicky 18」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.