昴宿星团：有七姐妹称号的星团

昴宿星团：有七姐妹称号的星团

Pleiades: The Seven Sisters Star Cluster
Image Credit & Copyright: Francesco Pelizzo

Explanation: Have you ever seen the Pleiades star cluster? Even if you have, you probably have never seen it as large and clear as this. Perhaps the most famous star cluster on the sky, the bright stars of the Pleiades can be seen with the unaided eye even from the depths of a light-polluted city. With a long exposure from a dark location, though, the dust cloud surrounding the Pleiades star cluster becomes very evident. The featured 23-hour exposure, taken from Fagagna, Italy covers a sky area several times the size of the full moon. Also known as the Seven Sisters and M45, the Pleiades lies about 400 light years away toward the constellation of the Bull (Taurus). A common legend with a modern twist is that one of the brighter stars faded since the cluster was named, leaving only six of the sister stars visible to the unaided eye. The actual number of Pleiades stars visible, however, may be more or less than seven, depending on the darkness of the surrounding sky and the clarity of the observer’s eyesight.

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昴宿星团：有七姐妹称号的星团
影像提供与版权: Francesco Pelizzo

说明: 你看过昴宿星团吗？即使有，你可能也不曾见过它这付大又清晰的样貌。昴宿星团或许是天空中最著名的星团，纵然在有光污染城市的中心，不需借助双筒望远镜也能看到星团内的亮星。如果在远离光害的地点进行长时间曝光取像，围拱着昴宿 星团成员星的尘埃会变得格外醒目。而这张摄于意大利 法加尼亚镇，跨幅约数个满月宽度的23小时长曝光影像即可为佐证。昴宿星团又名为七姐妹星团或M45，位在金牛座方向约400光年远之处。一则带点现代转折的传说宣称：在星团命名后，最亮的数颗星之一变暗，让星团只剩下6颗肉眼可见的亮星。然而，昴宿星团可见的星数可多于或少于7颗，端视观测者的视力与星空的幽暗程度而异。

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