titan is the only moon in the solar system to have a thick atmosphere. the titanean sky is a light tangerine color. however, an astronaut standing on the surface of titan would see a hazy brownish/dark orange color. as a consequence of its greater distance from the sun and the thickness of its atmosphere, the surface of titan receives only about of the sunlight earth does – daytime on titan is thus only as bright as twilight on the earth. it seems likely that saturn is permanently invisible behind orange smog, and even the sun would be only a lighter patch in the haze, barely illuminating the surface of ice and methane lakes. however, in the upper atmosphere, the sky would have a blue color and saturn would be visible. with its thick atmosphere and methane rain, titan is the only celestial body other than earth upon which rainbows on the surface could form. however, given the extreme thickness of the atmosphere in visible light, the vast majority of the rainbow would be in the infrared.