WALTER MYERS / SCIENCE PHOTO LIBRARY WALTER MYERS / SCIENCE PHOTO LIBRARY
Callisto spires. Computer artwork based on images from NASA's Galileo spacecraft of the surface of the massive Asgard impact basin of Callisto, one of Jupiter's satellites. Shown here are the numerous bright, icy spires that rise from an otherwise relatively flat, cratered terrain. The spires may consist of material thrown outward from a major impact billions of years ago.
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