Glossary term: 辐射区
Description: 恒星核心中的核聚变反应释放出能量，最终从恒星的光球层辐射到太空中。有几种方式可以将能量从恒星核心传输到光球层。其中，辐射区（又称辐射区域或辐射带）是恒星内部通过辐射方式将能量向外传输的区域。光子不断地与原子核和电子散射，在此过程中损失部分能量，同时产生新的热辐射光子。由于频繁的散射，能量传输过程缓慢；在我们的太阳中，光子需要数千年才能穿过辐射区。
太阳的辐射区位于核心和对流区之间。质量更大的恒星核心本身是对流的，辐射区从对流核心延伸到恒星的光球层。而质量低于0.3倍太阳质量的恒星没有辐射区，整个恒星为对流状态。
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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
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