Hey look, MLP fanart. So I tried a whole new style for this one. Is okay?
I've always thought of Lunas mane and tail to really be just filters for the world around her, eliminating all physical obstruction to see the night sky no matter where she is. Through the clouds, through the ground, she always has a clear image of the stars.
(This is why I have Orion right there in her hair.)
Full view or download for a wallpaper size.
Also, Sunrise in Equestria.