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Abell 31 is an ancient planetary nebula in the constellation of Cancer. It is estimated to be about 2,000 light years away. Although it is one of the largest planetary nebulae in the sky, it is not very bright. ==References== *http://www.astronomy-mall.com/Adventures.In.Deep.Space/abellcat *http://www.observing.skyhound.com/archives/feb/PNG_219.1+31.2 *http://www.astrosurf.com/zoll/images/abell31 *http://www.annesastronomynews/photo-gallery-ii/nebulae-clouds/abell-31-by-adam-block/ 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 31」の詳細全文を読む スポンサード リンク
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