Titan. Saturn Moons. This image is constructed from 4 images acquired through different color filters. The red and green colors are from colors where atmospheric methane absorbs light, and shows a brighter (redder) northern hemisphere because the in more high-altitude haze in the winter hemisphere. The blue is from an ultraviolet color and shows the high atmosphere and detached hazes.
Titan has a gigantic atmosphere, extending hundreds of kilometers above the surface. The sharp brightness variations on Titan's surface (and clouds near the south pole) come from an infrared filter where methane does not absorb light.
Photo : NASA JPL Cassini-Huygens Mission