Glossary term: 金屬
Description: 天文學中的金屬一詞通常指除氫或氦以外的化學元素。宇宙大爆炸後不久，核合成產生了一個幾乎完全是氫和氦的宇宙，只有微量的其他元素。隨著時間的推移，恆星內核中的核聚變將其中一些氫和氦轉化為碳、氧、氮和鐵等較重的元素。這些新的較重元素通過巨星內部的緩慢核反應（慢中子俘獲過程，s過程）以及超新星爆發和中子星碰撞中的快速核反應（快中子俘獲過程，r過程）進一步轉化，形成了我們今天所知的天然元素。恆星的金屬含量（稱為金屬丰度）隨著每一代恆星的誕生而增加。在我們的銀河系中，最古老的恆星通常具有最低的金屬丰度。
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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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