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01 : 33.2 (h:m) +60 : 42 (deg:m) 8.5 (kly) 7.4 (mag) 6.0 (arc min) M103（NGC 581）是位于仙后座的疏散星团。直径15光年，距离8500光年。约含172颗恒星。1781年被发现。蓝色的亮星们是疏散星团M103中最突出的一 群。疏散星团中的恒星们是由一团云气慢慢地凝结出来的，而且这些星也会慢慢地散开。在已形成的恒星中，最亮最蓝也是最重的恒星，早已耗尽它的核燃料，并且 在一次超新星爆炸中自我毁灭。根据理论计算的推论，M103中最亮的主序星的生命期大约是二千万年，也就是 air jordans 17 在 二千万年前，就可以看到M103中最亮的主序星了。事实上，星团的中央附近，就可以看到一颗前身是蓝色的主序星，但如今已经离开了主序带而演变成为红巨 星。一般而言，与大质量的蓝色恒星相比，类似太阳的黄色恒星在疏散星团中是比较暗而且也比较不明显的。用双筒望远镜可在仙后座方向找到的M103。
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