MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Illustration of Neptune seen from the surface of its largest moon, Triton. Triton has one of the coldest surfaces in the known Solar System. In this image we see Triton at night, with the Sun below the horizon to the rear. The surface is lit only by the ghostly glow of Neptune itself. The shadow of Triton cast by the Sun can be seen on Neptune's face.
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