If the mass of the white dwarf becomes greater than about 1 . 4 times the mass of the sun , it becomes unstable and is blown apart in a thermonuclear explosion 如果白矮星的质量超过了太阳的1 . 4倍,它会变得不稳定,并在热核爆炸中碎裂。
D . because the surge of nuclear fusion would expand the sun ' s core , the outer layers surrounding the core would be compressed , igniting nuclear fusion in the outer layers and destroying our star in a comprehensive thermonuclear explosion 太阳会变成一个更大、更热、更明亮的主序星并且会保持这种状态直到核心的氢燃料用尽为止。