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太阳为什么能发光呢？

太阳是由氢核融合反应产生能量的恒星，太阳内部的高温和高压导致氢原子核相互融合成氦原子核，释放出巨大的能量，这个过程称为核聚变。在核聚变反应中，氢核的质量稍微减少，转化为能量释放出来，根据质能方程E=mc²，能量和质量是等价的。这些能量以光和热的形式传播，使太阳发出明亮的光芒。

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