Mars Valley Networks: Chronology and Environments
نویسنده
چکیده
منابع مشابه
A Chronology of Mars Hydrological Evolution from Impact Degradation
Introduction: Impact crater degradation provides a powerful tool to analyze past Martian hydrological evolution. Previous studies concluded that large impact craters were strongly degraded during early Martian history, whereas younger craters are only weakly degraded [1]. Degraded craters are therefore one of the main lines of evidence for a warmer climate on early Mars. Global altimetry and re...
متن کاملA Chronology of Mars Hydrological Evolution from Impact Degradatio
Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page. Introduction: Impact crater degradation provides a powerful tool to analyze past Martian hydrological evolution. Previous studies concluded that large impa...
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[1] Valley networks appear to be cut by liquid water, yet simulations suggest that early Mars could not have been warmed enough by a CO2-H2O greenhouse to permit rainfall. The vulnerability of an early atmosphere to impact erosion, the likely rapid scavenging of CO2 from the atmosphere by weathering, and the lack of detection of weathering products all support a cold early Mars. We explore the ...
متن کاملOrientation of valley networks on Mars: The role of impact cratering
[1] We compare, on a global scale, the degree of correlation between orientation of stream networks and topographic aspect on Mars and Earth. The orientation of streams on Earth is a reflection of local, underlying geology but, in general, it correlates with regional topographic aspect. However, the orientation of valley networks, prominent features on Mars, thought to be fossils of ancient str...
متن کاملThe Effect of Resolution on Scaling Relations and Concavity on Valley Networks on Mars
Valley networks have been observed on Mars since the Viking orbiter took photos in 19761980. They are interpreted as an erosional record of a warmer, wetter Mars then what currently exists. Scaling relationships have been used to evaluate terrestrial streams and can be used on Mars. Results from these relationships can provide insight into the mechanisms that formed the valley networks. These r...
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تاریخ انتشار 2008