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【科学】为什么夜里天是黑的?
入得谷来,祸福自求。
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【科学】为什么夜里天是黑的?
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Jun
»
2012-09-30 14:04
你知道吗?
答案一点也不简单,需要动用不少近年来的天文物理学发现。下面是解释这个问题的视频:
http://www.youtube.com/watch?v=gxJ4M7tyLRE
此喵已死,有事烧纸
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