Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Ganymede's surface is slowly being pulled apart. The Galileo Spacecraft arrived at Jupiter in December 1995. In late June, the spacecraft passed within 10,000 kilometers of Ganymede 's icy surface, and took pictures showing complex surface details for the first time. The circular features are impact craters.
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