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2500-15-large satellites

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<strong>15</strong>.7 Comparing the Large Satellites<br />

Titan Point #2<br />

Like the Inner Planets, Titan Must<br />

Also Have Accumulated Some Gases<br />

as a Result of Cometary Impacts<br />

• Approximately 50% of Titan’s Initial Mass Was<br />

Water Ice That Now Forms a Crust and Mantle<br />

Around a Silicate Core<br />

• Titan Is Partially Made-Up of Comets That<br />

Added to the Volatile Mixture Accreted by the<br />

Original Icy Planetesimals

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