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NGC 2240 is an open cluster in the constellation Auriga. It was discovered by William Herschel on January 3, 1786, and is located about 5.1 thousand light-years away. == 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 2240」の詳細全文を読む スポンサード リンク
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