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A refined chronology of catastrophic outflow events in Ares Vallis, Mars

Muller, Jan-Peter; Gupta, Sanjeev; Kim, Jung-Rack +2 more

We investigate the geomorphology and chronology of catastrophic flooding in a major martian outflow channel, Ares Vallis. We use recently acquired stereo and colour images and derived topographic data with grid-spacing of 50 m from the High Resolution Stereo Camera (HRSC) onboard Mars Express to constrain the detailed flood geomorphology of proxim…

An equatorial periglacial landscape on Mars

Balme, M. R.; Gallagher, C.

We present evidence, drawn from new 25 cm/pixel "HiRISE" images of Mars, of landforms indicative of geologically-recent thaw degradation of ice-rich terrain near the Martian equator. We have focused our study on the head-region of Athabasca Vallis, a catastrophic flood-carved outflow channel thought to have been active within the last 2-8 Ma. The …

The present-day atmosphere of Mars: Where does it come from?

Chassefière, Eric; Gillmann, Cédric; Lognonné, Philippe +1 more

Recent observations and missions to Mars have provided us with new insight into the past habitability of Mars and its history. At the same time they have raised many questions on the planet evolution. We show that even with the few data available we can propose a scenario for the evolution of the Martian atmosphere in the last three billion years.…