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来自MSN
2 天
光速最快,但人类所能达到的最快速度却并非光速,它比光速慢得多
浩瀚的宇宙充斥着无尽的奥秘,所以人类有着一个梦想,那就是能够自由地穿梭在星际空间之中,而要实现这一梦想,关键就在于速度。
来自MSN
2 个月
如果反物质地球和地球相撞,会发生什么?
4.5x10^27焦耳,实在是太小儿科了; 直接轰掉地球,残骸飞出太阳系,再也不能结合在一起,所需能量:2.9x10^32焦耳,还差得远呢; 太阳每年释放的 ...
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