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More Mars pictures that show possible water courses

Now that we know what to look for, there is evidence of downhill water flows in many places on Mars. Here, the dark, narrow streaks flowing downhill on this portion of Horowitz Crater are suspected to be formed by seasonal flow of water. The streaks, called “recurring slope lineae” or RSL, are roughly the length of a football field.

The imaging and topographical information in this processed view come from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter.

NASA explains the image:

The image was produced by first creating a 3-D computer model (a digital terrain map) of the area based on stereo information from two HiRISE observations, and then draping an image over the land-shape model. The vertical dimension is exaggerated by a factor of 1.5 compared to horizontal dimensions. The draped image is a red waveband (monochrome) product from HiRISE observation PSP_005787_1475, taken on Oct. 21, 2007, at 32 degrees south latitude, 141 degrees east longitude. Other image products from this observation are at http://www.uahirise.org/PSP_005787_1475.

Bill Condie

Bill Condie

Bill Condie is a science journalist based in Adelaide, Australia.

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