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Voyager 1 photo of Callisto, Jupiter's fourth moon
Callisto. Voyager 1 photograph of Callisto, the outermost and faintest of the four Galilean moons of Jupiter. In the right of the image is a giant impact basin. This is about 600 km in diameter and is surrounded by bright concentric rings that stretch over a thousand kilometres. The rings are thought to have been caused by deformation of the crust as a result of the shock wave associated with the giant impact. The crust is believed to be a mixture of ice and rocky material, peppered with thousands of impact craters. The picture was taken on March 6, 1979, when the spacecraft was 350,000 km from Callisto. It shows features about 7 kilometres wide on the surface.
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