A Complete Collection of 100000 Whys
Fav十万个为什么
为什么星空是黑的？
1、宇宙是广阔的，但星星的数量是有限的，无法填满整个天空。
2、光线在宇宙中传播需要时间，我们看到的星星是它们很久以前发出的光，因此有些星星的光还没有到达地球。
3、地球大气层的散射和吸收作用会削弱星光，使得一些星光无法到达我们的眼睛。
4、宇宙中的黑暗物质和暗能量占据了宇宙总质能的大部分，这些物质不发光，因此使得宇宙显得更加黑暗。
5、宇宙的膨胀导致远处的星星光线被红移，能量减弱，甚至无法被我们观察到。
总之，星空是黑的，是因为宇宙的广阔、光传播的时间延迟、大气层的散射、黑暗物质的存在以及宇宙的膨胀等多种因素共同作用的结果。
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