... 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. ... Why is Saturn's small moon Telesto so smooth? ... M51: The Whirlpool Galaxy in Dust and Stars . ... At only 30 million light years distant and fully 60 thousand light years across, M51, also known as NGC 5194, is one of the brightest and most picturesque galaxies on the sky. ... The Color of the Moon . ...