{ "title": "HiPOD", "metadata": { "thumbnailURL": "bundle://header.jpg", "excerpt": "First imaged by one of the Viking orbiters back in the late 1970s and 1980s, our image shows frost on dunes in far greater detail." }, "version": "1.5", "identifier": "ESP_055385_1205", "language": "en", "layout": { "columns": 10, "width": 1024, "margin": 85, "gutter": 20 }, "documentStyle": { "backgroundColor": "#faf7f2" }, "components": [ { "role": "heading1", "layout": "heading1Layout", "text": "HiPOD: FRIDAY, 8 NOVEMBER 2019" }, { "role": "divider", "layout": "bigDividerLayout", "stroke": { "width": 3, "color": "#8c2028" } }, { "role": "title", "layout": "halfMarginBelowLayout", "text": "Monitoring Frost on Dunes Also Imaged by Viking" }, { "role": "photo", "layout": "fullBleedLayout", "caption": "Less than 5 km across. (NASA/JPL/University of Arizona)", "URL": "bundle://ESP_055385_1205-main.jpg" }, { "role": "body", "format": "html", "layout": "hipodMarginLayout", "text": "


Over the last 13 years, HiRISE has only imaged about 3 percent of the Martian surface. One of the reasons for this is because we often take repeat pictures in order to track changes over time.

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This is one of those repeat images: looking for changes in the frost on dunes that were also imaged by the Viking Orbiters (1976-1982). The black spots are likely the result of sublimation, when a solid state transforms directly into a gaseous one. Darker subsurface material is exposed, and then is moved about by the wind.

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These dunes are located within a large, unnamed crater to the southwest of the Hellas impact basin.

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ID: ESP_055385_1205
date: 21 May 2018
altitude: 250 km

NASA/JPL/University of Arizona

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