Thanks for you comments! It's interesting that you are so interested in the sky. I was too. In fact, this is a blend of two shooting experiences . . . here's the whole story:
This really is a striking image. As other people have noted the sky is perfect, and necessary as it is. Further, because of its essential truth, I think that the title helps direct people's feelings about the image, giving them an emotional and intellectual point build around.
All in all, just about a perfect match between idea and execution...a rare feat indeed.
In general, I prefer color. But I can do without it in this image. Did you enter this one back in the 'Look Up!' challenge? It would have been a contender.