1. Titan 21 October 2011

3. Titan [2003] Second-largest moon in SS Density ~1900 kg/m 3 thick atmosphere! Sublimation N 2 (90%), methane, ethane ethane may condense clouds, rain,oceans/lakes/ponds/erosion ??? Geology unknown due to thick atmosphere Voyager 1981

7. Titan [2005] Thick Atmosphere N 2 (90%), methane, ethane methane clouds, rain, lakes Geology Erosion!!!!!!!!!! Volcanism, Tectonics A few impact craters

9. Huygens Landing Site Rounded cobbles resemble Mars

11. Titan’s Lakes Of methane mostly (& ethane) Few 100m deep Red areas are those that changed between images a year apart Blue appeared 2004-5

12. solid vs. liquid False Color - Radar Reflectivity

13. North pole 20 times larger area of lakes than south pole Why? Seasonal – north pole was winter http://www.sciencedaily.com/ releases/2009/11/09112915 3401.htm

14. Cassini Radar images Lakes- high latitudes 440 km impact crater Minerva Braided channels – floods? Linear dunes near equator

15. Geology 25 km 440 km diameter Impact Crater Dune Field Cryovolcanic Extrusion ? Cryovolcanism Impact cratering Dune field formation

16. Atmospheric pressure at surface ~1.5 bars Upper haze layers Photochemical smog Temps ~80-90K = -300 F

17. Surface Chemistry and interaction with the atmosphere Ices + Liquids + Aerosol Precipitates

18. Methane rain Titan has a "hydrological cycle" like Earth but with methane instead of water!