A Lunar Corona with Jupiter and Saturn

Why does a cloudy moon sometimes appear colorful? The effect , called a lunar corona , is created by the quantum mechanical diffraction of light around individual, similarly-sized water droplets in an intervening but mostly-transparent cloud. Since light of different colors has different wavelengths , each color diffracts differently. Lunar Coronae are one of the few quantum mechanical color effects that can be easily seen with the unaided eye. Solar corona e are also sometimes evident. The featured composite image was captured a few days before the close Great Conjunction between Saturn and Jupiter last month . In the foreground, the Italian village of Pieve di Cadore is visible in front of the Sfornioi Mountains. New: APOD is now available in Taiwanese from National Central University