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  "title": "Mystery Mounds",
  "authors": "HiRISE",
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    "excerpt": "The objective of this observation is two examine these two pits in Amazonis Planitia: is their formation related to volcanic or tectonic activity?"
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  "identifier": "PSP_008778_1685",
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        "text": "HiPOD: 4 MAY 2020"
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        "text": "Mystery Mounds"
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        "caption": "Mystery mounds abound! Less than 5 km across. (NASA/JPL/UArizona)",
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        "text": "<p><br />This image was targeted because a previous Mars Orbiter Camera image showed a distinctive field of mounds on the floor of an ancient, large, filled-in crater.</p>"
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        "text": "<p><br />The origin of the mounds was unclear, so we hoped that a HiRISE image with higher resolution and color would solve the mystery. The HiRISE image shows much more detail on the mounds and other rough textures, indicating that this is an eroded bedrock surface, perhaps exposed by removal of an overlying layer of fine-grained materials by the wind.</p>"
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        "text": "<p>But how did the rocks form, and why did they erode onto mounds? It could have been lava or impact ejecta or fluvial sediments, perhaps altered and indurated by groundwater. The mounds could be due to how it was deposited—like hummocky impact ejecta—or how it was indurated. In other words, we haven’t solved the mystery!</p>"
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        "caption": "A closeup of some of the mounds in enhanced color. Less than 1 km across. (NASA/JPL/UArizona)",
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        "text": "<br /><p>ID: <a href='https://uahirise.org/PSP_008778_1685'>PSP_008778_1685</a><br />date: 10 June 2008<br />altitude: 256 km<br /><br />NASA/JPL/UArizona</a></p>"
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        "layout": "halfMarginBothLayout",
        "text": "Black and white image is less than 5 km across; enhanced color is less than 1 km. For images with scalebars, see the above ID link to our website.<br />"
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