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2500-15-large satellites

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Ganymede: A<br />

Moon with a<br />

History<br />

• Old, Dark Terrains and<br />

Less Cratered, Light<br />

Terrains Modified by<br />

Internal Activities<br />

• Cater Densities on Light<br />

Terrains –<br />

100-200 10 Km Craters<br />

Per 1 Million Km 2<br />

Much Lower Than the Heavily<br />

Cratered Areas of Callisto or<br />

Ganymede<br />

• Crater Retention Ages of<br />

1-2 Billion Years

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