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Our sky is blue DURING THE DAY because of two things:
1) sunlight is entering our atmosphere
2) our atmosphere is thick enough to preferentially scatter blue light.
If either (1) or (2) cease to be true, then the sky will NOT be blue.
As night "falls," the sky does not go instantly from blue to black. Instead, less and less of our Sun's light is available to scatter, and thus the sky goes slowly from blue to black.
It's the same way as you go higher and higher. There is no altitude at which there is simply no longer enough atmosphere to scatter enough sun light to give the sky a blue look. It is more the case that, as you go higher and higher, the sky becomes less and less blue -- just like at night "fall."
For SOME idea of how our sky changes, check out a video of a space shuttle launch.
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∙ 12y ago
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