Impact topography Mars

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bonneville crater , spirit rover s lander


the dichotomy of martian topography striking: northern plains flattened lava flows contrast southern highlands, pitted , cratered ancient impacts. research in 2008 has presented evidence regarding theory proposed in 1980 postulating that, 4 billion years ago, northern hemisphere of mars struck object one-tenth two-thirds size of earth s moon. if validated, make northern hemisphere of mars site of impact crater 10,600 8,500 km (6,600 5,300 mi) in size, or area of europe, asia, , australia combined, surpassing south pole–aitken basin largest impact crater in solar system.



fresh asteroid impact on mars @ 3°20′n 219°23′e / 3.34°n 219.38°e / 3.34; 219.38. these before , after images of same site taken on martian afternoons of march 27 , 28, 2012 respectively (mro)


mars scarred number of impact craters: total of 43,000 craters diameter of 5 km (3.1 mi) or greater have been found. largest confirmed of these hellas impact basin, light albedo feature visible earth. due smaller mass of mars, probability of object colliding planet half of earth. mars located closer asteroid belt, has increased chance of being struck materials source. mars more struck short-period comets, i.e., lie within orbit of jupiter. in spite of this, there far fewer craters on mars compared moon, because atmosphere of mars provides protection against small meteors , surface modifying processes have erased craters.


martian craters can have morphology suggests ground became wet after meteor impacted.








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