Studying globular clusters therefore tells us about the history of our galaxy.

因此，研究球状星团可以向我们揭示银河系的历史。

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Back in the old days, back when our Galaxy first formed, perhaps thousands of globular clusters roamed our Galaxy.

回到过去，回到我们的星系刚形成时，可能有数千球状星团在银河系内游荡。

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The spectrum reveals emission from oxygen and nitrogen but no hydrogen, a rare set of signals from within globular clusters.

频谱显示出氧和氮，但没有氢，一个球状星团内罕见的信号。

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Using their least conservative assumptions, the researchers found that less than 2% of the globular clusters should contain intermediate mass black holes today.

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"We were preparing for a long, systematic search of thousands of globular clusters with the hope of finding just one black hole, " said Dr Maccarone.

BBC: NEWS | Science/Nature | Black hole found in ancient lair

Led by George Daley of Children's Hospital in Boston, the researchers began their process by culturing mouse embryonic stem cells to form globular clusters called embryoid bodies.

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