NASA photographs of sand geysers on Mars
<ul><li>Dark spots (left) and 'fans' appear to scribble dusty hieroglyphics on top of the Martian south polar cap in two high-resolution Mars Global Surveyor, Mars Orbiter Camera images taken in southern spring. Each image is about 3-kilometers wide (2-miles).</li></ul>
NASA/JPL/Malin Space Science Systems
<ul><li><a rel="nofollow" class="external free" href="https://photojournal.jpl.nasa.gov/catalog/PIA08658">https://photojournal.jpl.nasa.gov/catalog/PIA08658</a></li>
<li><a rel="nofollow" class="external free" href="https://www.newscientist.com/article/dn9765-sand-geysers-could-explain-mystery-spots-on-mars/">https://www.newscientist.com/article/dn9765-sand-geysers-could-explain-mystery-spots-on-mars/</a></li></ul>
the image is attributed to NASA