EPISODE · Jan 14, 2020 · 7 MIN
向天空打开手电筒照射一秒,光什么时候能到达宇宙尽头?
from 天文随心听|讲述宇宙与人的故事
即使你在地球诞生的时候向天空打开手电,到现在为止它也只不过传播了45亿光年,只是宇宙大小的二十分之一而已,而且它将永远都到不了宇宙的尽头!
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向天空打开手电筒照射一秒,光什么时候能到达宇宙尽头?
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