• Martian dunes in “V” formation

    Date:10 July 2014 Tags:, , ,

    Migratory birds and military aircraft often fly in a V-shaped formation. The “V” formation greatly boosts the efficiency and range of flying birds, because all except the first fly in the upward motion of air – called upwash – from the wingtip vortices of the bird ahead.

    In this image of Martian dunes in a large crater near Mawrth Vallis, some of the dunes appear to be in a V-shaped formation. For dune fields, the spacing of individual dunes is a function of sand supply, wind speed, and topography.

    This image was acquired by the HiRISE camera aboard Nasa’s Mars Reconnaissance Orbiter on 30 December 2013.

    Image credit: Nasa/JPL-Caltech/University of Arizona
    Caption credit:  Alfred McEwen

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