Let's get real technical.
Did you take the picture with your camera of the moon in the background? Or did you get it off the internet or out of a book? Was it in public domain or did you steal it from someone else's site or publication?
It matters. If you do not or did not get permission to use the photo of the moon someone that actually owns the right to that picture can sue you for that.
Now do you really want to cause a fuss about someone else that has a similar, not exact or even close picture, similar to your logo?
That's all i'm going to say about it.