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In 2005 the Cassini spacecraft confirmed what we already assumed: Saturn's sky above its thick clouds is blue. As blue as Earth's sky. Rayleigh scattering occurs when light passes through a transparent medium consisting of molecules whose size is much smaller than the wavelength of the scattered photons. The amount of scattering is inversely proportional to the wavelength of the light, so it affects mainly the short wavelengths: The blue light is much more scattered than the yellow light or the red light. The atmosphere of Saturn is made up of hydrogen, while on Earth it is nitrogen and oxygen. But the physical principle occurs equally in both cases. Other places in the Solar System with blue skies are Jupiter, Uranus, Neptune and Titan (above the layer of hydrocarbon haze). Surely the Universe is full of billions of worlds with blue skies ...