匡算;
Since all the stars in a cluster are roughly the same age it is possible, by looking at the masses of stars that have made it to the red giant stage, to calculate the age of the cluster and, consequently, of all its members.
由于同一星群的所有恒星的星龄大致一样,根据(该星群)的大部分恒星已经进入红巨星阶段的恒星,从而估计出星群的星龄,和因此而推算出该成员的星龄。
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