A Complete Collection of 100000 Whys
Fav十万个为什么
为什么白天会天亮？
1、太阳是地球的主要光源，它通过发射光和热来照亮地球。太阳的巨大能量来自于其内部的核聚变反应。
2、地球自转使得太阳光能够照射到地球的不同区域。地球每天自转一周，因此不同地区会依次经历白天和黑夜。
3、太阳光在真空中的传播速度极快，大约每秒30万公里，因此我们能够在短时间内看到太阳升起。
4、地球大气层对太阳光有折射作用，使得太阳光在日出和日落时能够稍微弯曲，使得即使在太阳实际还在地平线以下时，我们也能看到天亮。
5、太阳光照射到地球时，会被大气中的气体和尘埃散射，使得天空呈现蓝色。这种散射作用也是天亮时天空明亮的原因之一。
总之，白天天亮是因为地球自转使得太阳光照射到地球表面，同时太阳光的传播和大气层的折射作用使得我们能够在特定时间看到天亮。
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