Windows to the Universe

This drawing shows an old model of the possible interior of Callisto. It has been shown that Callisto has no core, nevertheless, as shown in the drawing, there may be currents circulating near the surface of Callisto. (Courtesy of The New Solar System. )

NASA

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This drawing shows an old model of the possible interior of Callisto. It has been shown that Callisto has no core, nevertheless, as shown in the drawing, there may be currents circulating near the surface of Callisto. (Courtesy of The New Solar System. ) NASA

This drawing shows an old model of the possible interior of Callisto. It has been shown that Callisto has no core, nevertheless, as shown in the drawing, there may be currents circulating near the surface of Callisto. (Courtesy of The New Solar System. ) NASA

This drawing shows an old model of the possible interior of Callisto. It has been shown that Callisto has no core, nevertheless, as shown in the drawing, there may be currents circulating near the surface of Callisto. (Courtesy of The New Solar System. ) NASA

This drawing shows an old model of the possible interior of Callisto. It has been shown that Callisto has no core, nevertheless, as shown in the drawing, there may be currents circulating near the surface of Callisto. (Courtesy of The New Solar System. )

NASA

This drawing shows an old model of the possible interior of Callisto. It has been shown that Callisto has no core, nevertheless, as shown in the drawing, there may be currents circulating near the surface of Callisto. (Courtesy of The New Solar System. )

NASA

This drawing shows an old model of the possible interior of Callisto. It has been shown that Callisto has no core, nevertheless, as shown in the drawing, there may be currents circulating near the surface of Callisto. (Courtesy of The New Solar System. )

NASA