The mysterious ridges at the mouth of Tiu Valles

These images taken by the High Resolution Stereo Camera (HRSC) on board Mars Express show the mouth of the Tiu Valles channel system on the red planet.

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<p><a href="http://www.physorg.com/news108820821.html">The mysterious ridges at the mouth of Tiu Valles</a></p> <p>These images taken by the High Resolution Stereo Camera (HRSC) on board Mars Express show the mouth of the Tiu Valles channel system on the red planet.</p>