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Spring arrives at a martian pole and the cap of carbon dioxide ice starts to sublimate (it goes directly from ice to vapour). In this region are troughs that form a starburst spider like pattern. They are believed to be formed by gas flowing beneath the seasonal ice to openings where the gas escapes, carrying along dust from the ground below the ice. The dust falls to the surface of the ice in fan-shaped deposits.

CREDIT: NASA/JPL-Caltech/University of Arizona.