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Abell 78 is a planetary nebula located in the constellation of Cygnus. ==Composition== Made up of a fainter halo (mostly hydrogen) and an inner elliptical ring that is mostly made of helium. 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「Abell 78」の詳細全文を読む スポンサード リンク
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