L17GH09_Large_and_Small_terrestrial_bodi

L17GH09_Large_and_Small_terrestrial_bodi - Terrestrial...

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March, 2009 terrestrial bodies I Terrestrial bodies pausing to reflect… A look at surfaces of large and small bodies
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March, 2009 terrestrial bodies I Terrestrial Planet Interiors – key concepts Clues to internal structure, composition • density: bulk, uncompressed, crust vs. overall -> composition • moment of inertia -> mass distribution • seismology -> detailed internal structure • differentiation -> hot in the past • magnetic fields -> fluid metal core Sources of internal heat •g r a v i t y • radioactivity • differentiation •t i d e s Cooling • mechanisms and heat loss • effect of size, mass Comparison of major bodies • internal structure, composition etc • current internal T • Relation to surface evolution
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March, 2009 terrestrial bodies I Terrestrial Planet Surfaces – key concepts Impact craters • common feature of SS surfaces • due to impacts from space, much more common in the past • surface density primarily related to surface age • other factors – location, gravitational focussing, type of planetesimal • size of crater depends on mass and velocity of impactor • analysis of all factors allows estimation of surface age • most bodies show range of surface ages… Volcanic features • volcanic craters different in appearance from impact ones • variety of volcanic features found in SS • presence => internal heating Tectonics • Large scale/global forces at work that alter surface • Compression, stretching, cooling, plate movement… Weathering • Alteration of surface due to wind, water • Surface chemical reactions important – see Earth, Mars
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terrestrial bodies I Terrestrial Planet Atmospheres – key concepts Origin: Primary or Secondary? • H, He not retained by inner planets – high T, low v esc • terrestrial atmospheres “secondary” 9 primarily outgassed from planetary interior • Jovian planet atmospheres “primary” 9 lower T, higher mass (v esc ) -> H, He retained • magnetic fields -> fluid metal core Current atmospheres are the result of atmospheric evolution •v esc depends on T, planet mass -> retention, composition • planetary interior and outgassing • distance from Sun Atmospheric composition • variation of T, ρ , composition with altitude Atmosphere/surface connection • weather •C O 2 –how ,
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This note was uploaded on 04/15/2009 for the course PHYS 275 taught by Professor Harris during the Winter '09 term at Waterloo.

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L17GH09_Large_and_Small_terrestrial_bodi - Terrestrial...

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