EAS206 Lecture Notes - Lecture 19: Roche Limit, Planetary Nebula, Tidal Heating
18 Jul 2020
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Describe saturn"s rings in terms of composition, features, and relationship to moons, and explain which hypothesis for their origin is the most likely and why. Based on order in which they were discovered. Gravitational disruption of a satellite or comet. Passing body gets torn apart by saturn"s gravity. Roche limit: the orbit closest to a planet where a satellite can withstand the tidal forces of the planet. A moon or moons in the ring system was fragmented by collision with a comet. Dynamic, causes the rings to be replenished. Rings are young 10 - 100 ma) A planetary nebula accreted to form the moons, but accretion could not form moons inside the roche limit. Describe saturn"s moon titan in terms of geologic processes, climate and interior structure. Accretion from materials rich in water, methane, ammonia nh ) Patchy lakes or seas of liquid hydrocarbons could be driving an ethane- based weather cycle on tian, with towering clouds and frequent rain.
