Description: 星團是由恆星組成的星群，其所有組成的恆星都位於天空的同一區域，與我們的距離一致，化學成分和運動方式相似，年齡通常也大致相同。星團中的恆星很可能是由同一氣體雲形成的。星團的密度分布可以是集中在中心的球形，也可以是形狀更為復雜的球形。它們大致分為兩種類型：疏散星團和球狀星團。疏散星團比較年輕（幾百萬年到大約 40-50 億年），有幾百到幾千顆恆星，可能有來自原氣體雲的相關氣體和塵埃殘餘。 在銀河系中，疏散星團通常位於星系盤中。球狀星團是最古老的星團之一，大多數都有 100 多億年的歷史。它們是中心集中的球形星團，包含數千到數百萬顆恆星。在銀河系中，球狀星團通常位於銀暈中。

Related Terms:

• 銀盤
• 銀暈
• 球狀星團
• 銀河系
• 恆星
• 恆星形成
• 疏散星團

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

This is an automated transliteration of the simplified Chinese translation of this term

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