lecture_19 - M a r s i n H i s t o r y Lattimer, AST 248,...

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Unformatted text preview: M a r s i n H i s t o r y Lattimer, AST 248, Lecture 19 p.1/16 M a r s i n H i s t o r y Lattimer, AST 248, Lecture 19 p.2/16 Lattimer, AST 248, Lecture 19 p.3/16 M a r s Mass (1/10), radius (1/2) and atmosphere (.7.9%) smaller than Earths. Rotation rate is nearly that of Earths. Reddish color due to iron oxide. Noachian epoch: before 3.5 Gyr; oldest surface features (Tharsis bulge) and late, extensive water flooding Hesperian epoch: between 1.8 and 3.5 Gyr; formation of extensive lava plains Amazonian epoch; after 1.8 Gyr; formation of Olympus Mons and other lava flows Lattimer, AST 248, Lecture 19 p.4/16 M a r s G e o l o g y Has craters and high volcanos (higher than on Earth due to lower gravity). No active volcanos or geologic activity for last 12 Byrs, due to low mass and therefore less radioactivity. Valles Marineres is a large canyon (7 km deep, 100 km wide, stretches 1/4 across planet), formed by cracking of crust as Mars cooled. Lattimer, AST 248, Lecture 19 p.5/16 M a r s T o p o g r a p h y Lattimer, AST 248, Lecture 19 p.6/16 M a r s A t m o s p h e r e Polar caps (H 2 O mostly, with surface CO 2 ) which grow and shrink according to the seasons. Atmosphere only 0.7% of Earths, below the triple point of water, so no liquid water possible at any temperature. 95.7% CO 2 , 2.7% N 2 , 1.6% Ar, 0.2% O 2 , 0.07% CO, 0.01% H 2 O, 0.01% NO 2 Lattimer, AST 248, Lecture 19 p.7/16 M a r s D u s t S t o r m s High velocity winds and giant dust storms on occasion. Winds caused by large temperature differences between day/night and pole/equator and by CO 2 condensation/evaporation. Dust loading catastrophically develops into storms like a super Dust Bowl (no vegetation to block it)....
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lecture_19 - M a r s i n H i s t o r y Lattimer, AST 248,...

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