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温度的本质其实是微观粒子的热运动的剧烈程度。太空并非是绝对零度的，而是2.7K，高于绝对零度2.7度。而由于太空十分的空旷，因此，太空实际上并不能显现出温度来。用低温灭火利用的原理是降低温度，隔绝空气。太阳利用的是核聚变反应，是在引力作用下实现的，和温度和空气无关。地球之所以能够接收到太阳辐射是距离不算太远，可以直接接受太阳辐射。
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