M45: The Pleiades Star Cluster

夜空 · 发表于 2006-1-9 16:54:18

[center]Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2006 January 9

http://antwrp.gsfc.nasa.gov/apod ... des_gendler_big.jpg

M45: The Pleiades Star Cluster
Credit & Copyright: Robert Gendler
Explanation: Perhaps the most famous star cluster on the sky, the Pleiades can be seen without binoculars from even the depths of a light-polluted city. Also known as the Seven Sisters and M45, the Pleiades is one of the brightest and closest open clusters. The Pleiades contains over 3000 stars, is about 400 light years away, and only 13 light years across. Quite evident in the above photograph are the blue reflection nebulae that surround the brighter cluster stars. Low mass, faint, brown dwarfs have also been found in the Pleiades. (Editors' note: The prominent diffraction spikes are caused by the telescope itself and may be either distracting or provide aesthetic enhancement, depending on your point of view.)

Tomorrow's picture: phasing out venus [/center]

天狼星YAN · 发表于 2006-1-9 16:59:30

美，这是不是昴星团？

b777200 · 发表于 2006-1-9 20:43:42

多漂亮的蓝色！

昴星团

影像提供及版权：Robert Gendler

说明：昴星团或许是全天最著名的星团，甚至可以不用双筒望远镜，在光害严重的城市的夜空里观察到它。它同时也被称为七姊妹与M45，昴星团是最亮且最靠近我们的疏散星团之一。昴星团有超过3000颗成员星，距离大约 400 光年，大约只有13光年宽。上面的照片中，蓝色的反射星云明显可见，并围绕着星团里较亮的成员星。低质量且黯淡的褐矮星同样也已经在昴星团里被发现了。（编按：明显的绕射星芒是由望远镜造成的，但星芒是分散或提供了更多的美学价值，那就看你怎么想了。）（翻译：陈昌）

天狼星YAN · 发表于 2006-1-9 20:59:40

知道了，谢谢！

Debug · 发表于 2006-1-9 21:33:53

这张确实太漂亮了

夜猫子 · 发表于 2006-1-11 19:28:50

又一张最新靓照！美！

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