Description: 星团是由恒星组成的星群，其所有组成的恒星都位于天空的同一区域，与我们的距离一致，化学成分和运动方式相似，年龄通常也大致相同。星团中的恒星很可能是由同一气体云形成的。星团的密度分布可以是集中在中心的球形，也可以是形状更为复杂的球形。它们大致分为两种类型：疏散星团和球状星团。疏散星团比较年轻（几百万年到大约 40-50 亿年），有几百到几千颗恒星，可能有来自原气体云的相关气体和尘埃残余。 在银河系中，疏散星团通常位于星系盘中。球状星团是最古老的星团之一，大多数都有 100 多亿年的历史。它们是中心集中的球形星团，包含数千到数百万颗恒星。在银河系中，球状星团通常位于银晕中。

Related Terms:

• 银盘
• 银晕
• 球状星团
• 银河系
• 恒星
• 恒星形成
• 疏散星团

Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

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