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Present-Day Gully Formation on Mars

Present-Day Gully Formation on Mars. Precise targeting by MRO/HiRISE enables extensive repeat imaging to detect changes. Activity is common: 14% of southern-hemisphere monitoring sites show changes in at least one gully over a mean interval of ~2 Mars years.

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Present-Day Gully Formation on Mars

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  1. Present-Day Gully Formation on Mars • Precise targeting by MRO/HiRISE enables extensive repeat imaging to detect changes. • Activity is common: 14% of southern-hemisphere monitoring sites show changes in at least one gully over a mean interval of ~2 Mars years. • Changes in gullies include channel incision and substantial mass movements, and fresh-appearing sites are the most likely to be active. • Activity is seasonally controlled and correlated with seasonal frost, which is mostly CO2. • “Gully-forming” mass movements are distinct from RSL, the most likely candidates for present-day surface liquid. RSL may drive formation of some fine channels. • Current processes with little or no liquid water appear capable of driving most gully formation. Dundas et al., 2014, in press (Icarus)

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