{ "title": "HiPOD", "metadata": { "thumbnailURL": "bundle://header.jpg", "excerpt": "The resolution power of HiRISE gives us the ability to measure the depth of exit breaches from craters called “pollywogs.”" }, "version": "1.5", "identifier": "ESP_055266_2210", "language": "en", "layout": { "columns": 10, "width": 1024, "margin": 85, "gutter": 20 }, "documentStyle": { "backgroundColor": "#faf7f2" }, "components": [ { "role": "heading1", "layout": "heading1Layout", "text": "HiPOD: TUESDAY, 22 OCTOBER 2019" }, { "role": "divider", "layout": "bigDividerLayout", "stroke": { "width": 3, "color": "#8c2028" } }, { "role": "title", "layout": "halfMarginBelowLayout", "text": "Into the Breach!" }, { "role": "photo", "layout": "fullBleedLayout", "caption": "This cutout shows a crater with an exit breach. (NASA/JPL/University of Arizona)", "URL": "bundle://ESP_055266_2210-main.jpg" }, { "role": "caption", "layout": "halfMarginBothLayout", "text": "Less than 5 km across, 298 km above the surface. (NASA/JPL/University of Arizona)" }, { "role": "body", "format": "html", "layout": "hipodMarginLayout", "text": "

Here’s a new term for you: pollywog. Small craters with one or more exit breaches and an exterior rim channel are called “pollywogs,” a term that implies overflow of a crater and presumed presence of a deep (possibly ice-covered) lake.

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This observation was requested to measure the depth of the exit breach and depth/width of associated flood channels. Was this a single catastrophic flood or seasonally repeating flow?

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NASA/JPL/University of Arizona
ID: ESP_055266_2210

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