this is due to something called "Rayleigh Scattering," which means the longer wavelengths (red, orange, yellow) of light pass right through our atmosphere while the shorter wavelengths (blue) get scattered when they hit molecules in the air.
It's not a pr0n don't worry, it's just nasty. I saw it, I think it's sick, but more importantly what was the point? To gross out others? Unless your really messed up don't try to find it...