太阳大气有个风吹草动,都有可能引发日冕物质的抛射。太阳就像是打喷嚏一样,喷出了十几亿吨的带电粒子。万一奔着地球这个方向来了,地球就够受的。大耀斑发出的强紫外线会直接加热地球的高层大气,日冕抛射物质是带电的高能粒子。而且有磁场。通过一连串的连锁反应,最终还是会使得大气的温度升高。偏偏天空实验室的太阳望远镜拍摄到了耀斑爆发的照片,当时他们也没意识到这对于自己意味着什么。这张照片意味着,如果NASA不采取措施,天空实验室命不久矣。其实近地轨道空间并不是完全没有空气,大气层并没有明确的边界,只是越往上,空气越是稀薄。天空实验室所在的轨道高度是428~438公里,在这个高度,大气层几乎是感觉不到的。但是如果是年头多了,大气产生的阻力还是会消耗空间站的能量,轨道高度会越来越低的。而且还是恶性循环,越低,空气越是稠密,阻力越大,最后就会坠入大气层烧毁……
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