40亿年后，太阳体积会膨胀到上百万倍，地球将是一个怎样的世界？【太空科学站】
Synopsis
如今太阳的氢元素大约还能燃烧40亿年左右，在40亿年之后恒星的氢元素将会完全耗尽，到时候太阳将会膨胀为红巨星！ Youtube的 ...
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