2500-15-large satellites
2500-15-large satellites
2500-15-large satellites
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<strong>15</strong>.7 Comparing the Large Satellites<br />
Ganymede and Callisto<br />
Why Did Ganymede Differentiate and Maintain a<br />
Substantial Level of Geological Activity for Millions of<br />
Years While Callisto Did Not ?<br />
Shown to Scale in this Composite Galileo Photograph