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DDO 169 : ウィキペディア英語版
DDO 169

DDO 169 is an irregular galaxy located in the constellation Canes Venatici. It is a member of the M51 Group of galaxies and measures approximately 5 x 1.5 kiloparsecs (16,000 x 5,000 lightyears).〔 The galaxy's large-scale structure is very unorganized and it has two clusters of stars in its outer portions in addition to the cluster in the center. These clusters make it practically impossible to determine the galaxy's rotation curve and contributes to a large variation in distance figures that are derived with different methods.〔〔 The exact distance to the galaxy is not known, although a 1998 paper estimated the distance as 8.23 megaparsecs.〔
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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