Today's Mars Photo is of gullies in Avire Crater as taken by Mars Reconnaissance Orbiter's HiRISE camera. There is a large amount of controversy as to how the gullies formed, but since the debris seems to be flowing down the crater it likely required carbon dioxide or water in a liquid state. The crater is under regular observation from HiRISE to note any changes.
This image links to a larger version of this image witth a caption provided by HiRISE.
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