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太阳燃烧了46亿年，怎么没有变小？太阳最终会变大还是会变小？
如果是一块烧着的煤球，它用不了多久就会烧成灰烬，体积也比原来小了很多。那为什么太阳都燃烧了46亿年了，怎么还没有变小呢？别急，太阳烧到最后也会变小的。那么，太阳在燃烧的过程中会有哪些变化呢？
神奇的太阳系79/108
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