... Saturn Storm by Ringshine . ... Credit Copyright: Cassini Imaging Team , SSI , JPL , ESA , NASA Explanation: Imaged on the night side of Saturn by the Cassini spacecraft , these swirling storm clouds are illuminated by ringshine - sunlight reflected from the gas giant's magnificent ring system . The storm (top) was actually spotted last month by amateur astronomers as it rotated across Saturn's day side and spans about 3,500 kilometers. ... Publications with keywords: Saturn - storm - lightning . ...