Description: 原恆星是恆星形成過程的早期階段。它是星際介質中巨大分子雲收縮後形成的大量氣體和塵埃。隨著分子雲的坍縮，引力勢能轉化為熱能，使仍在形成中的原恆星升溫。這一階段可能需要 10⁵ 到 10⁷ 年，具體時間取決於恆星的質量，質量越大的恆星形成得越快。這個過程始於分子雲核心密度的增加，終於前主序星的形成。質量與太陽相近的前主序星被稱為金牛座T型恆星（T-Tauri）。一旦恆星內的氫聚變被點燃，它就開始產生能量，成為主序星。

Related Terms:

• 主序
• 恆星形成
• 星際介質
• 分子雲

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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