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1d
保护万物的地球磁场正在经历反转,是好是坏?人类该如何应对?
地球磁场就像一个隐形的防护罩,保护着地球上的万物免受宇宙的“毒打”。但你造吗?这个防护罩可不是一成不变的,它会“翻跟头”! 科学家们研究了海底的“老古董”和石头,发现一个惊人的事实:在过去的7600万年里,地球磁场竟然翻转了171次,最近的一次“翻车 ...
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1d
地球周边行星卫星布满陨石坑,地球上为何能看到的不多?
一、为啥月球陨石坑那么多,地球却很少?和撞击概率、大气层有关吗? 大家都知道,地球有大气层罩着,不仅能保温,还能削弱陨石的杀伤力。其实每年都有大约5万吨的陨石想“碰瓷”地球,但在大气层里摩擦燃烧后,能落到地上的就少得可怜了,妥妥的“人间蒸发”。
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