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George Touryliov

George Touryliov

To Astronomy21/04/2017

Mars' northern hemisphere contains this impressive gully, seen by our Mars Reconnaissance Orbiter. Gullies are active in the winter due to carbon dioxide frost, but northern winters are shorter and warmer than southern ones, so there is less frost and less gully activity. Details: http://go.nasa.gov/2oPEphs

George Touryliov
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