Description: 主序是赫羅圖上一個細長的恆星群，其上的恆星處於主要的氫聚變演化階段。除質量最小的恆星以外，其他恆星在完成核心氫聚變後都會脫離主序，開始進入巨星階段的演化。主序上的恆星通常被稱為矮星，以區別於巨星。主序上的熱恆星比主序上的冷恆星更亮。最熱的恆星消耗氫的速度很快，因此通常只在主序上停留幾百萬年。像太陽這樣的恆星在主序上的時間約為百億年，而較冷的恆星在主序上保持穩定氫聚變的時間甚至更長。

Related Terms:

• 矮星
• 巨星
• 赫羅圖
• Hydrogen Fusion
• 恆星演化

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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