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A pinwheel nebula is a ''nebulous region'' in the shape of a pinwheel. ==Spiral galaxies== (詳細はmisnomer used by observers before Edwin Hubble realized that these spiral shaped nebulae were actually 'island universes'. 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「Pinwheel nebula」の詳細全文を読む スポンサード リンク
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