Unlike Saturn, which has actual, physical rings, the ring you can sometimes see around the moon is merely an optical illusion.
Learn about peripheral vision and color on this Moment of Science.
Who are these color-gifted critters? Hawkmoths. Almut Kelber from Sweden’s Lund University conducted an experiment that showed this surprising result. Imagine a room with a lot of artificial flowers in it, and the only ones with yummy sugar water in them are yellow or blue.