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NGC 2158
NGC 2158 is an open cluster in the constellation of Gemini. It is located southwest of open cluster Messier 35, and is believed to be about 2 billion years old.〔 The two clusters are unrelated, as NGC 2158 is around 9,000 light years further away than M35. Once thought to be a globular cluster, NGC 2158 is now known to be an intermediate-age, metal-poor open cluster that is a member of the old thin disk population.〔 ==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 2158」の詳細全文を読む
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