06-Sep13u[1] - What have we learned from the Earth from the...

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Unformatted text preview: What have we learned from the Earth from the standpoint of comparative planetology ? Massive terrestrial planet Radioactive heating => asthenosphere, plate tectonics, volcanism => magnetic Feld Atmosphere => erosion, surface features relatively young, carbon dioxide and the greenhouse effect, temperature near triple-point for water Rotation and atmosphere => storms and weather The Moon: Earths Sister Planet Important lunar periods Synchronous rotation: rotation period is the same as orbital period = 27.3 days Synodic period is 29.5 days (full moon to full moon; Analogous to solar day) Libration : moon wobbles so we can see 59% instead of only 50% of the surface from earth this is caused by the slightly elliptical orbit of the moon Phases of the Moon Keep Synodic Period Of Time and Tides Causes of tides: Gravity stretches two objects orbiting each other Body tides : moving of rocks and crust Ocean tides : moving of water Synchronous rotation is explained by tidal locking : tides raise bulges, friction slows (or speeds up) rotation to locked point Ocean Tides on the Earth...
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This note was uploaded on 11/27/2011 for the course AST 301 taught by Professor Harvey during the Spring '07 term at University of Texas at Austin.

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06-Sep13u[1] - What have we learned from the Earth from the...

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