When the atmospheric surface pressure is just right, a temperature difference can drive a continuous flow of rarefied gas through the soil matrix — a previously unrecognized process on Mars.
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Schörghofer, N. Subsurface air flow on Mars. Nature Phys 10, 14–15 (2014). https://doi.org/10.1038/nphys2841
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DOI: https://doi.org/10.1038/nphys2841
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