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NGC 51 is a spiral galaxy in the constellation Andromeda. It has a diameter of 90,000 light-years.〔 The galaxy was discovered on September 7, 1885 by Lewis Swift, who called it "Pretty faint, pretty small, round, brighter middle."〔 ==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 51」の詳細全文を読む スポンサード リンク
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