Mention rainbows, and the image that comes to mind is that of a beautiful translucent arc of bright colors bending towards the horizon. But in a recent image captured by Italian astrophotographer Marcella Giulia Pace and shared by NASA on March 11, 2022, the rainbow is turned around — making it appear like it is smiling! Magical as it sounds, the reason for the stunning phenomenon, called a circumzenithal arc, is rooted in science.