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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

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