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This narrow-angle camera image of Saturn's mysterious satellite Iapetus was taken by Voyager 1 through the clear filter from a distance of 2.5 million km on 15 November 1980. The dramatic brightness change between hemispheres is clearly seen here. Even with the bright side overexposed, the dark surface is still not visible.
The Voyager Project is managed for NASA by the Jet Propulsion Laboratory, Pasadena, Calif.