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Abell 12
Abell 12 is a planetary nebula located in the constellation of Orion. It is known as the "hidden planetary" nebula because of the foreground star Mu Orionis making it difficult to observe. ==References==
*http://www.astronomy-mall.com/Adventures.In.Deep.Space/abellcat *http://www.observing.skyhound.com/archives/jan/PNG_198.6-06.3 *http://www.caelumobservatory.com/gallery/abell12.s
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 12」の詳細全文を読む
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