In the middle of the 20th century, however, the astronomer Walter Baade noticed that the stars in older parts of the galaxy, like its core or globular clusters, are older and have fewer metals.

  • 但在20世纪中叶,天文学家瓦尔特·巴德(Walter Baade)注意到,该星系的古老星团比如它的核心星团或球状星团中的恒星年代更为久远,金属元素更少。

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