“恒星群”是天文学专有名词。来自中国天文学名词审定委员会审定发布的天文学专有名词中文译名。
每隔10天的周期就会有一些特殊的恒星群出现，这些恒星群被称为 decans。
Each period of ten days was marked by the appearance of special groups of stars called decans.
脉冲星是某一恒星群发生爆炸形成超新星后所遗留下来的密核。
Pulsars are the dense cores left over after stars of a certain mass explode into supernovae.
另一个原因是它们非常稀少，只在最密集的恒星群中才有。
Another is that they're extremely rare, forming only in the densest star clusters.
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