The sky does not skip over the green range of frequencies. The sky *is* green. Remove the scattered light from the Sun and the Moon and even the starlight, if you so wish, and you'll be left with something called [airglow](http://www.universetoday.com/112237/how-to-see-airglow-the-green-sheen-of-night/) (check out the link, it's awesome, great pics, and nice explanation).

Because the link does such a good job explaining airglow, I'll skip the nitty gritty.

So you might be thinking, "Jim, you half-insane ceiling fan, everybody knows that the night sky is black!" Well, you're only half right. The night sky isn't black. The link above explains the science of it, but if that's not good enough, try to remember back to a time when you might have been out in the countryside. No bright city lights, just the night sky and trees. Now when you look at the horizon, can you see the trees? Yes, they're black silhouettes against the night sky. But how could you see black against black? The night sky isn't black. It's green thanks to airglow (or, if you're near a city, orange thanks to light pollution).

Stop, it's picture time. Here's an above the atmosphere view of the night sky from Wikipedia:

<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Cupola_above_the_darkened_Earth.jpg/640px-Cupola_above_the_darkened_Earth.jpg" height="600">

And one from the link I posted, just in case you didn't check it out:

<img src="http://d1jqu7g1y74ds1.cloudfront.net/wp-content/uploads/2014/06/Airglow-NE-May-24-2014S-580x386.jpg">

See, don't be worried about green. The sky gets around to being green all the time.