I saw these amazing clouds over the northern part of Europe today. I haven't figured out what type of clouds they are, or what they are. They aren't Northern Lights. I've seen Northern Lights, and they dance. These weren't dancing. They were way higher than clouds tend to be - we were flying at 38,000 feet. The pilots thought they were ice crystals acting as a prism to the sunrise, but neither of them had ever seen anything like it before. It was amazing and beautiful.