{ "title": "Ancient Rivers", "authors": "HiRISE", "metadata": { "thumbnailURL": "https://static.uahirise.org/anews/2021-04-27/ESP_042924_2195.jpg", "excerpt": "The channel pattern, called “dendritic” because of its tree–like branching, begins at the top of the image and runs down over the rim of an ancient impact basin." }, "version": "1.5", "identifier": "ESP_042924_2195", "language": "en", "layout": { "columns": 10, "width": 1024, "margin": 85, "gutter": 20 }, "documentStyle": { "backgroundColor": "#faf7f2" }, "components": [ { "role": "heading1", "layout": "heading1Layout", "text": "HiPOD: 27 April 2021" }, { "role": "divider", "layout": "bigDividerLayout", "stroke": { "width": 3, "color": "#8c2028" } }, { "role": "title", "layout": "halfMarginBelowLayout", "text": "Ancient Rivers" }, { "role": "photo", "layout": "fullBleedLayout", "caption": "Exactly how these channels formed—by rainfall, snowmelt, or seepage from underground springs—is often debated. Less than 5 km across. (NASA/JPL/UArizona)", "URL": "https://static.uahirise.org/anews/2021-04-27/ESP_042924_2195.jpg" }, { "role": "body", "format": "html", "layout": "hipodMarginLayout", "text": "


Early in Martian history, liquid water energetically carved the surface, forming channel systems that look remarkably similar to river valleys and drainage networks on Earth. Exactly how these channels formed—by rainfall, snowmelt, or seepage from underground springs—is often debated.

Our image shows an example of just such a water-carved channel. The channel pattern, called “dendritic” because of its tree–like branching, begins at the top of the image and runs down over the rim of an ancient impact basin across the basin floor.

The soil surface overlying these channels, and indeed the entire landscape, has been changed and reworked over the intervening millions of years, by the combined actions of wind and ice. Over time, the original channels become muted or even erased. Nevertheless, some characteristics of the smallest tributary channels are still visible at scales seen by HiRISE. (Note: the black bars indicate unrecoverable data that could not be processed.)

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ID: ESP_042924_2195
date: 23 September 2015
altitude: 298 km (185 mi)

NASA/JPL/UArizona

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