Okay. I don't want to cheat and google it. So, my honest answer is that I don't remember. I may be wrong but it's got something to do with sunlight reflecting off of Earth's atmosphere.
you have the right idea. just blue sky.
the photons bouncing around off the molecules in the atmosphere creates the blue sky affect which also covers the moon. where the moon actually is in the sky right now all you see is blue sky. pretty wacky.
__________________ "Is all that we see or seem
but a dream within a dream?"
-Edgar Allan Poe
"...the man and the peaked cap he is said to have worn
quite tallies with the descriptions I got of him."
-Frederick G. Abberline