class30 - causing gaps and other structures Jupiter Uranus...

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AST 309 The Solar System MWF 12-1 John Lacy RLM 16.332 471-1469 [email protected] Class web page: www.as.utexas.edu -> courses -> AST 309 -> class web page user: AST, pwd: 309 Marty Bitner RLM 16.312, MW 10-11 471-8275 [email protected] Steve Young RLM 9.312, Th 3-5 [email protected]
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Reading for next week Ch. 11, Uranus and Neptune Assignment for Wednesday: Describe with one sentence for each the three most important ideas in the chapter, and tell me something that confused you or you want to know more about. Test next Monday The test will cover Venus-Saturn, with comparisons to the Earth. Pick up a review sheet.
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Planetary Rings Rings consist of many independently orbiting objects, which are arranged in very thin disks. Inside the ‘Roche radius’, about 2.5 times the radius of the planet, gravity cannot pull ring particles together to form moons, and moons are likely to fall apart. The gravity of moons orbiting outside of the rings (or small moons in the rings) affect the orbits of the ring particles,
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Unformatted text preview: causing gaps and other structures. Jupiter, Uranus, and Neptune have rings made of rocks. Saturn’s rings are mostly dirty snowballs. Although the compositions of the ring particles could be explained by the conditions when their planets formed, other evidence suggests that the rings are quite young. Perhaps moons or comets collided to form the rings. Titan: like the Earth? Titan has mountains, rivers, seas, volcanoes, sand dunes, impact craters, an atmosphere, clouds, and probably even rain. But all of these features are very different from ours. The mountains are made of ice. The rivers were cut by liquid methane and ethane. The seas contain liquid methane and ethane. The volcanoes erupt water and ice. The sand dunes are made of grains of ice. The atmosphere, like ours, is mostly nitrogen. But methane rather than oxygen is next most abundant. And the clouds and rain are made of methane and ethane....
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class30 - causing gaps and other structures Jupiter Uranus...

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