HiRISE: Hardened dunes in Arcadia Planitia

ESP_038143_2205HiRISE, with its high resolution and 8 years in orbit about Mars, has shown that many dunes and ripples on the planet are active. This demonstrates that in some areas sand is loose enough and winds strong enough, that significant change can occur. Nevertheless, other Martian dunes are clearly inactive… [More at link]

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