A ring of illuminated ice crystals encircle an Alaskan moon

Our sun isn't the only object in the sky that can produce spectacular optical effects. Take this photograph taken by Sebastian Saarloos on a cold, starlit Alaskan night. This is what's called a "moondog" — a rainbow-like ring around the moon that's caused by the reflection of moonlight (which is reflected sunlight) from … » 1/30/13 8:20am 1/30/13 8:20am