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NGC 206 is a bright star cloud in the Andromeda Galaxy. It is notable for being the brightest star cloud in Andromeda as viewed from Earth. == Features == NGC 206 is the richest and most conspicuous star cloud in the Andromeda Galaxy as well as one of the largest and brightest star formation regions of the Local Group.〔 〕 It contains more than 300 stars brighter than Mb=-3.6. It was originally identified by Edwin Hubble as a star cluster but today, due to its size, it is classified as an OB association. NGC 206 is located in a spiral arm of the Andromeda Galaxy, in a zone free of neutral hydrogen and has a double structure, with one region that has an age of around 10 million years and includes several H II regions in one of its borders and other with an age of between 40 million years and 50 million years that includes a number of cepheids. Both parts are separated by a band of interstellar dust and include hundreds of stars of spectral type O and B.〔 〕 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 206」の詳細全文を読む スポンサード リンク
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