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This 2011 view near the top of the southern rim of Tivat Crater comes from the HiRISE camera on NASA's Mars Reconnaissance Orbiter. It shows the inner slope of a crater on southern Mars with several of the seasonal dark streaks called "recurrent slope li (Image: NASA/JPL-Caltech/UA/USGS) This 2011 view near the top of the southern rim of Tivat Crater comes from the HiRISE camera on NASA's Mars Reconnaissance Orbiter. It shows the inner slope of a crater on southern Mars with several of the seasonal dark streaks called "recurrent slope lineae," or RSL. A November report interprets those as granular flows, rather than darkening due to flowing water.