Voyager 2 / Galileo. These two images of the same region of Ganymede compare the resolution returned by the Voyager 2 spacecraft and by the Galileo craft. Each pixel in the left frame is four-fifths of a mile across while each pixel in the right frame is just 243 feet. This means that the resolution of the Galileo picture, on the right, is 17 times better than that of the Voyager 2 photograph, which was taken when the craft passed by in 1979. While the Voyager captured the light-colored ridges and dark areas, there was little detail; the picture returned by Galileo, however, shows much more definition and many intricate ridges and ripples not seen from Voyager. Courtesy NASA/Jet Propulsion Laboratory.
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