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NGC 6881
NGC 6881 is a planetary nebula, located in the constellation of Cygnus. It is formed of an inner nebula, estimated to be about one fifth of a light-year across, and symmetrical structure that spread out about one light-year from one tip to the other. The symmetry could be due to a binary star at the nebula's centre. == References ==
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「NGC 6881」の詳細全文を読む
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