The old age typical of the globular clusters in our galaxy has had a profound impact on the study of globulars in general.

在我们星系中，这些典型的老年球状星团对于一般球状星团的研究影响深远。

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All this activity occurs early in the life span of a galaxy, before it settles down into a quiet middle age.

WSJ: Book Review: Gravity's Engines