{
  "title": "Dunes on Ridges",
  "authors": "HiRISE",
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    "excerpt": "This observation shows dark sand dunes marching over the ridges created by an alluvial fan in an impact crater."
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        "text": "HiPOD: 1 September 2020"
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        "text": "Dunes on Ridges"
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        "caption": "Less than 1 km across. (NASA/JPL/UArizona)",
        "URL": "https://static.uahirise.org/anews/2020-09-01/ESP_025625_1580.jpg"
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        "text": "<p><br />This observation shows dark sand dunes marching over the ridges created by an alluvial (water-deposited) fan in an impact crater.</p>"
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        "text": "<p><br />These dunes may be active today, but we haven’t yet observed them at significantly different times to measure the movement. The dunes are moving from northwest (upper left) to southeast, with the steep slope facing downwind.<br /></p>"
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        "role": "photo",
        "layout": "fullBleedLayout",
        "caption": "A fuller view of the scene. Less than 5 km across. (NASA/JPL/UArizona)",
        "URL": "https://static.uahirise.org/anews/2020-09-01/ESP_025625_1580-2.jpg"
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        "text": "<p><br />ID: <a href='https://uahirise.org/ESP_025625_1580'>ESP_025625_1580</a><br />date: 14 January 2012<br />altitude: 257 km<br /><br />NASA/JPL/UArizona</a></p>"
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        "text": "Enhanced color image is less than 1 km across; black and white image is less than 5 km. For full images with scalebars, see the above ID link to our website.<br /><br />"
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