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NGC 40
NGC 40 (also known as the Bow-Tie Nebula and Caldwell 2) is a planetary nebula discovered by William Herschel on November 25, 1788, and is composed of hot gas around a dying star. The star has ejected its outer layer which has left behind a smaller, hot star with a temperature on the surface of about 50,000 degrees Celsius.〔(【引用サイトリンク】title=Chandra X-Ray Observatory )〕 Radiation from the star causes the shed outer layer to heat to about 10,000 degrees Celsius,〔 and is about one light-year across.〔 About 30,000 years from now, scientists theorize that NGC 40 will fade away, leaving only a white dwarf star approximately the size of Earth.〔 ==Gallery==
File:The Bowtie Nebula HST.jpg|HST
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 40」の詳細全文を読む
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