![](https://66.media.tumblr.com/f28c1fcd0144936c3d2878fb7e348209/tumblr_pxyo5zJomX1ugf5nao1_500.jpg)
In the dune fields of Mars, springtime defrosting occurs from the bottom up, trapping gas between the ice and the sand. As the ice cracks, this gas is released violently and carries sand with it, forming dark patches and streaks. Credit: ESA via /r/spaceporn https://ift.tt/304vnk7
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