missississi

August 9, 2007

梅西耶67星团

Filed under: 客舟

来自APOD

聚集在照片中央的M67,是已知最老的疏散星团之一。尽管疏散星团通常很年轻,M67却有40亿高龄,年龄和元素丰度都与太阳相似。疏散星团常常比较年轻,因为随着时间的推移,他们在绕着星系中心转的时候,逐渐被遇到的其它恒星、星际云的引力潮驱散。M67却留下来了,它包含500多颗恒星,离我们2800光年远,在巨蟹座。据距离估计,M67直径12光年。

 

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