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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 Helmi stream ： ウィキペディア英語版 Helmi stream The Helmi stream is a stellar stream of the Milky Way galaxy. It started as a dwarf galaxy, now absorbed by the Milky Way as a stream. It was discovered in 1999, is formed of old stars deficient in heavy elements and has a mass of 10 to 100 million solar masses. It was absorbed by the Milky Way some 6 to 9 billion years ago.〔Scientific American, ("Extragalactic Expat: Newfound Exoplanet Likely Came from Another Galaxy" ), John Matson , 18 November 2010〕 ==Extragalactic planet== The Helmi stream was home to the first planet purportedly of extragalactic origin, orbiting the star HIP 13044.〔 Unfortunately, further analysis of radial velocity data failed to confirm the discovery. 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「Helmi stream」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.