lecture_21 - www.nineplanets.org Lattimer AST 248 Lecture...

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www.nineplanets.org Lattimer, AST 248, Lecture 21 – p.1/17
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Titan Only moon with substantial atmosphere, 1.5 times Earth’s Saturn’s largest satellite and second largest in Solar System Atmosphere a result of relatively cold temperature and high gravity Major gases are N 2 (98.4%), CH 4 (1.6%), Ar; smog (hydrocarbon, tholin) at high altitude. Lack of noble gases Kr, Xe and Ne suggest atmosphere formed as a result of outgassing rather than by cometary impacts. Haze results in anti-greenhouse effect: opaque to visibile, clear to infrared. Methane (CH 4 ) is present and must be replenished, indicating volcanos or lakes of methane or ethane (C 2 H 6 ). Cassini probe mapped surface in 2004. Surface temperature is 94 K, methane rain may exist Surface is complex, fluid-processed and geologically young (H 2 O and NH 3 volcanos?) Lattimer, AST 248, Lecture 21 – p.2/17
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Titan’s Interior NASA Evidence for H 2 O-NH 3 ocean from ELF radio waves Lattimer, AST 248, Lecture 21 – p.3/17
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Titan’s Climate NASA Lattimer, AST 248, Lecture 21 – p.4/17
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Lattimer, AST 248, Lecture 21 – p.5/17
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Titan’s Surface NASA Lattimer, AST 248, Lecture 21 – p.6/17
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