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2500-15-large satellites

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

Titan Point #3<br />

Titan Must Have Lost Most of Its<br />

Original Atmosphere<br />

• Light Isotopes of Nitrogen Are Strongly<br />

Depleted in Titan’s HCN<br />

(Atmosphere Has Changed Throughout Time)<br />

• BUT - Like MARS<br />

Carbon Shows No Signs of<br />

Isotopic Fractionation<br />

(Always Being Replaced)

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