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Wind blowing over sand on Earth produces decimeter-wavelength ripples and hundred-meterto kilometer-wavelength dunes: bedforms of two distinct size modes. Observations from the Mars Science Laboratory Curiosity rover and the Mars Reconnaissance Orbiter reveal that Mars hosts a third stable wind-driven bedform, with meter-scale wavelengths. These bedforms are spatially uniform in size and typically have asymmetric profiles with angle-of-repose lee slopes and sinuous crest lines, making themdoi:10.1126/science.aaf3206 pmid:27365444 fatcat:3dfpgiocozglvos5g7iwh33cre