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Wild Duck Cluster : ウィキペディア英語版 | Wild Duck Cluster
The Wild Duck Cluster (also known as Messier 11, or NGC 6705) is an open cluster in the constellation Scutum. It was discovered by Gottfried Kirch in 1681. Charles Messier included it in his catalogue in 1764. The Wild Duck Cluster is one of the richest and most compact of the known open clusters, containing about 2900 stars. Its age has been estimated to about 220 million years. Its name derives from the brighter stars forming a triangle which could resemble a flying flock of ducks (or, from other angles, one swimming duck). ==Gallery==
File:Eso1430a.jpg|The blue stars in the centre of the image are the young, hot stars of the cluster. File:Messier11.jpg|M11 is visible with binoculars towards the constellation of Scutum.
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「Wild Duck Cluster」の詳細全文を読む
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