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1厘米大小的一块塑料，以每秒6.7公里的速度，撞上一大块铝板，会砸出这样一个大坑——这...
source link: http://dig.chouti.com/pic/show?nid=2579e6f9078302374fd04cc4a05ffc99&lid=26077146
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1厘米大小的一块塑料，以每秒6.7公里的速度，撞上一大块铝板，会砸出这样一个大坑——这就是太空碎片的可怕之处。图片来源：Erik D. Reedy
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