{"id":326659,"date":"2025-11-28T15:01:00","date_gmt":"2025-11-28T05:01:00","guid":{"rendered":"https:\/\/science.nasa.gov\/earth\/earth-observatory\/rings-of-rock-in-the-sahara\/"},"modified":"2025-11-28T15:01:00","modified_gmt":"2025-11-28T05:01:00","slug":"rings-of-rock-in-the-sahara","status":"publish","type":"post","link":"https:\/\/www.vibewire.com.au\/?p=326659","title":{"rendered":"Rings of Rock in the Sahara\u00a0"},"content":{"rendered":"<div id=\"\" class=\" hds-module hds-module-full alignfull wp-block-nasa-blocks-secondary-navigation\">\n<div class=\"hds-secondary-navigation-wrapper z-top width-100 padding-0\">\n<div id=\"\" class=\"hds-secondary-navigation width-full border-bottom-1px text-center hds-color-mode-dark hds-module hds-module-full alignfull wp-block-nasa-blocks-hdsnav\"><button type=\"button\" class=\"hds-secondary-nav-mobile-button display-flex tablet:display-flex desktop:display-none width-full flex-align-center bg-carbon-90 border-color-carbon-80 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id=\"basic-nav-section-one\" class=\"usa-nav__submenu\" hidden>\n<li class=\"usa-nav__submenu-item \"><a class=\"usa-nav__link\"  href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/subscribe\" rel=\"noopener\">Subscribe<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/nav>\n<\/div>\n<div class=\"hds-secondary-navigation-menu-spacer\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"\" class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-none \"><a href=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446.jpg?w=720&#038;h=480&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" rel=\"noopener\"><img decoding=\"async\" width=\"720\" height=\"480\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446.jpg?w=720&#038;h=480&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"A top-down view shows circular rocky formations rising from a flat, sandy-brown landscape. Darker brown sand encircles the rocky rings, with lighter patches of outwash spreading across the terrain.\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446.jpg?w=720&#038;h=480&#038;fit=crop&#038;crop=faces%2Cfocalpoint 720w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446.jpg?w=300&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446.jpg?w=400&#038;h=267&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446.jpg?w=600&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\">September 13, 2025<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p>In northeastern Africa, within the driest part of the Sahara, dark rocky outcrops rise above pale desert sands. Several of these formations, including Jabal Arakan\u016b, display striking ring-shaped structures.\u00a0\u00a0<\/p>\n<p>Jabal Arkan\u016b (also spelled Arkenu) lies in southeastern Libya, near the border with Egypt. Several other massifs are clustered nearby, including <a href=\"https:\/\/earthobservatory.nasa.gov\/images\/80599\/jebel-uweinat\"  rel=\"noreferrer noopener\">Jabal Al Awaynat<\/a> (or Uweinat), located about 20 kilometers (12 miles) to the southeast. Roughly 90 kilometers to the west are the similarly named <a href=\"https:\/\/earthobservatory.nasa.gov\/images\/35830\/arkenu-craters-libya\"  rel=\"noreferrer noopener\">Arkenu structures<\/a>. These circular features were once thought to have formed by meteorite impacts, but later <a href=\"https:\/\/doi.org\/10.1111\/maps.12012\"  rel=\"noreferrer noopener\">fieldwork suggested<\/a> they resulted from terrestrial geological processes.\u00a0\u00a0\u00a0<\/p>\n<p>Arkan\u016b\u2019s ring-shaped structures also have an earthly origin. They are <a href=\"https:\/\/doi.org\/10.37376\/sjuob.v35i1.3258\"  rel=\"noreferrer noopener\">thought to have formed<\/a> as magma rose toward the surface and intruded into the surrounding rock. Repeated intrusion events produced a series of overlapping rings, their centers roughly aligned toward the southwest. The resulting ring complex\u2014composed of igneous basalt and granite\u2014is bordered to the north by a hat-shaped formation made of sandstone, limestone, and quartz layers.\u00a0<\/p>\n<p>This photograph, taken by an astronaut aboard the International Space Station on September 13, 2025, shows the massif casting long shadows across the desert. The ridges stand nearly 1,400 meters above sea level, or about 800 meters above the surrounding sandy plains. Notice several outwash fans of boulders, gravel, and sand spreading from the mountain\u2019s base toward the bordering longitudinal dunes.\u00a0\u00a0\u00a0<\/p>\n<p>Two wadis, or typically dry riverbeds, wind through the structure. However, water is scarce in this part of the Sahara. <a href=\"https:\/\/doi.org\/10.1175\/JCLI-D-14-00145.1\"  rel=\"noreferrer noopener\">Past research<\/a> using data from NASA and JAXA\u2019s <a href=\"https:\/\/www.nasa.gov\/technology\/the-trmm-rainfall-mission-comes-to-an-end-after-17-years\/\"  rel=\"noreferrer noopener\">now-completed Tropical Rainfall Measuring Mission<\/a> (TRMM) indicated that southeastern Libya, along with adjacent regions of Egypt and northern Sudan, receives only about 1 to 5 millimeters of rain per year. Slightly higher accumulations, around 5 to 10 millimeters per year, occur near Jabal Arkan\u016b and neighboring massifs, suggesting a modest <a href=\"https:\/\/www.britannica.com\/science\/orographic-precipitation\"  rel=\"noreferrer noopener\">orographic effect<\/a> from the mountains.\u00a0\u00a0<\/p>\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<p><em>Astronaut photograph <a href=\"https:\/\/eol.jsc.nasa.gov\/SearchPhotos\/photo.pl?mission=ISS073&#038;roll=E&#038;%23038;frame=698446\"  rel=\"noreferrer noopener\">ISS073-E-698446<\/a> was acquired on September 13, 2025, with a Nikon Z9 digital camera using a focal length of 800 millimeters. It is provided by the ISS Crew Earth Observations Facility and the Earth Science and Remote Sensing Unit, Johnson Space Center. The image was taken by a member of the <a href=\"https:\/\/www.nasa.gov\/mission\/expedition-73\/\"  rel=\"noreferrer noopener\">Expedition 73 crew<\/a>. The image has been cropped and enhanced to improve contrast, and lens artifacts have been removed. The <a href=\"https:\/\/www.nasa.gov\/international-space-station\/\"  rel=\"noreferrer noopener\">International Space Station Program<\/a> supports the laboratory as part of the <a href=\"https:\/\/www.nasa.gov\/international-space-station\/space-station-research-and-technology\/iss-national-laboratory\/\"  rel=\"noreferrer noopener\">ISS National Lab<\/a> to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the NASA\/JSC <a href=\"https:\/\/eol.jsc.nasa.gov\/\"  rel=\"noreferrer noopener\">Gateway to Astronaut Photography of Earth<\/a>. Story by Kathryn Hansen.\u00a0\u00a0<\/em><\/p>\n<h2 class=\"wp-block-heading\"><strong>References<\/strong>\u00a0&#038; Resources<\/h2>\n<ul class=\"wp-block-list\">\n<li>Afkareen, M. M., <em>et al<\/em>. (2022) <a href=\"https:\/\/doi.org\/10.37376\/sjuob.v35i1.3258\"  rel=\"noreferrer noopener\">Lineament Mapping of Jabal Arkenu in Southern Libya<\/a>. <em>The Scientific Journal of University of Benghazi<\/em>, 35(1).\u00a0<\/li>\n<li>Alghariani, M. (2020) <a href=\"https:\/\/www.researchgate.net\/publication\/340299232\"  rel=\"noreferrer noopener\">Applications of Remote Sensing for Exploration of Mineral Deposits and Gold in Jabal Arkenu<\/a>. <em>Fourth International Conference on Geospatial Technologies Libya GeoTec4 in Tripoli \u2013 Libya<\/em>.\u00a0<\/li>\n<li>Cigolini, C., <em>et al<\/em>. (2012) <a href=\"https:\/\/=\/\"  rel=\"noreferrer noopener\">Endogenous and nonimpact origin of the Arkenu circular structures (al-Kufrah basin\u2014SE Libya)<\/a>. <em>Meteoritics &#038; Planetary Science<\/em>, 47(11), 1772-1788.\u00a0<\/li>\n<li>Kelley, O. A. (2014) <a href=\"https:\/\/doi.org\/10.1175\/JCLI-D-14-00145.1\"  rel=\"noreferrer noopener\">Where the Least Rainfall Occurs in the Sahara Desert, the TRMM Radar Reveals a Different Pattern of Rainfall Each Season<\/a>. <em>Journal of Climate<\/em>, 27(18), 6919\u20136939.\u00a0<\/li>\n<li>NASA Earth Observatory (2024, January 23) <a href=\"https:\/\/earthobservatory.nasa.gov\/images\/152356\/water-beneath-the-sand\"  rel=\"noreferrer noopener\">Water Beneath the Sand<\/a>. Accessed October 30, 2025.\u00a0<\/li>\n<li>NASA Earth Observatory (2013, March 9) <a href=\"https:\/\/earthobservatory.nasa.gov\/images\/80599\/jebel-uweinat\"  rel=\"noreferrer noopener\">Jebel Uweinat<\/a>. Accessed October 30, 2025.\u00a0<\/li>\n<li>NASA Earth Observatory (2008, November 10) <a href=\"https:\/\/earthobservatory.nasa.gov\/images\/35830\/arkenu-craters-libya\"  rel=\"noreferrer noopener\">Arkenu Craters, Libya<\/a>. Accessed October 30, 2025.\u00a0<\/li>\n<\/ul>\n<div id=\"\" class=\"hds-featured-file-list bg-spacesuit-white padding-x-2 tablet:padding-x-3 desktop:padding-x-4 padding-y-5 desktop:padding-y-6 hds-module hds-module-full alignfull wp-block-nasa-blocks-file-list\">\n<div class=\"grid-container grid-container-block padding-0\">\n<div class=\"grid-row width-full margin-bottom-4\">\n<div class=\"grid-col-12 desktop:grid-col-6 margin-bottom-2 desktop:margin-bottom-0\">\n<h2 role=\"textbox\" class=\"heading-22\">\n\t\t\t\t\tDownloads\t\t\t\t<\/h2>\n<\/p>\n<\/div>\n<div class=\"grid-col-12 desktop:grid-col-6\">\n<div class=\"desktop:grid-col display-flex flex-align-center desktop:flex-justify-end\">\n\t\t\t\t\t\t\t\t\t<\/div>\n<\/p>\n<\/div>\n<\/div>\n<div class=\"hds-list-row hds-file-list-row\">\n<div class=\"hds-list-thumbnail hds-file-list-thumbnail\">\n<div class=\"hds-list-thumbnail-inner hds-file-list-thumbnail-inner hds-cover-wrapper\">\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"8256\" height=\"5504\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=8256&#038;h=5504&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-thumbnail size-thumbnail\" alt=\"A top-down view shows circular rocky formations rising from a flat, sandy-brown landscape. Darker brown sand encircles the rocky rings, with lighter patches of outwash spreading across the terrain.\" style=\"transform: scale(1.2); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" data-video-loop=\"\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=8256&#038;h=5504&#038;fit=crop&#038;crop=faces%2Cfocalpoint 8256w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=300&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=768&#038;h=512&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=1024&#038;h=683&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=1536&#038;h=1024&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1536w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=2048&#038;h=1365&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2048w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=400&#038;h=267&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=600&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=900&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=1200&#038;h=800&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2025\/rings-of-rock-in-the-sahara-\/iss073e0698446_lrg.jpg?w=2000&#038;h=1333&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2000w\" sizes=\"auto, (max-width: 8256px) 100vw, 8256px\" \/><\/figure>\n<\/div>\n<\/div>\n<div class=\"hds-list-details\">\n<div 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class=\"grid-container grid-container-widescreen padding-x-3\">\n<div class=\"grid-row flex-align-start margin-bottom-3\">\n<div class=\"desktop:grid-col-8 margin-bottom-2 desktop:margin-bottom-0\">\n<h2 class=\"section-heading-sm line-height-sm\">You may also be interested in:<\/h2>\n<p class=\"margin-top-0 margin-bottom-2 maxh-tablet\">Stay up-to-date with the latest content from NASA as we explore the universe and discover more about our home planet.<\/p>\n<\/p>\n<\/div>\n<\/div>\n<div class=\"grid-row grid-container grid-container-block padding-0 margin-0 flex-justify-center\">\n<div class=\" grid-col-12\">\n<div class=\"grid-row grid-container grid-container-block padding-0\" style=\"display: block\">\n<div id=\"filter-tags\" class=\"grid-col-12 filter-tags-container\"><\/div>\n<\/p>\n<\/div>\n<div class=\"smd-orbit-loader\" role=\"status\" aria-hidden=\"true\">\n<div class=\"orbit-plane\"><span class=\"orbit-dot\"><\/span><\/div>\n<\/div>\n<div id=\"post-list-container\" class=\"hds-content-items hds-content-items-grid margin-top-2\" aria-live=\"polite\" data-rest-url=\"https:\/\/science.nasa.gov\/wp-json\/smd\/v1\/content-list\">\n<div class=\"hds-content-item content-list-item-post\">\n                    <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/nighttime-over-the-eastern-pacific-154648\/\" class=\"hds-content-item-thumbnail\" rel=\"noopener\"><\/p>\n<figure class=\"hds-media-background  content-list-thumbnail\"><img decoding=\"async\" loading=\"lazy\" data-no-id=\"true\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/imagerecords\/154000\/154648\/ISS072-E-896652.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;w=300 300w\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/imagerecords\/154000\/154648\/ISS072-E-896652.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;%23038;w=300\" ><\/figure>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-inner\">\n            <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/nighttime-over-the-eastern-pacific-154648\/\" class=\"hds-content-item-heading\" rel=\"noopener\"><\/p>\n<div class=\"hds-a11y-heading-22\">Nighttime Over the Eastern Pacific<\/div>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-readtime label margin-bottom-1\">\n                    2 min read                <\/div>\n<p class=\"margin-top-0 margin-bottom-1\">A long-exposure photo taken from low Earth orbit captured the brilliant illumination coming from airglow, lightning, and stars.<\/p>\n<div class=\"display-flex flex-align-center label color-carbon-60 margin-bottom-auto\"><svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg><span>Article<\/span><\/div>\n<\/p>\n<\/div>\n<\/div>\n<div class=\"hds-content-item content-list-item-post\">\n                    <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/a-northwest-night-awash-in-light-154757\/\" class=\"hds-content-item-thumbnail\" rel=\"noopener\"><\/p>\n<figure class=\"hds-media-background  content-list-thumbnail\"><img decoding=\"async\" loading=\"lazy\" data-no-id=\"true\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/imagerecords\/154000\/154757\/iss072e806482.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;w=300 300w\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/imagerecords\/154000\/154757\/iss072e806482.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;%23038;w=300\" ><\/figure>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-inner\">\n            <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/a-northwest-night-awash-in-light-154757\/\" class=\"hds-content-item-heading\" rel=\"noopener\"><\/p>\n<div class=\"hds-a11y-heading-22\">A Northwest Night Awash in Light<\/div>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-readtime label margin-bottom-1\">\n                    3 min read                <\/div>\n<p class=\"margin-top-0 margin-bottom-1\">The glow of city lights, the aurora, and a rising Moon illuminate the night along the northwest coast of North\u2026<\/p>\n<div class=\"display-flex flex-align-center label color-carbon-60 margin-bottom-auto\"><svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg><span>Article<\/span><\/div>\n<\/p>\n<\/div>\n<\/div>\n<div class=\"hds-content-item content-list-item-post\">\n                    <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/a-halo-above-the-horizon-154679\/\" class=\"hds-content-item-thumbnail\" rel=\"noopener\"><\/p>\n<figure class=\"hds-media-background  content-list-thumbnail\"><img decoding=\"async\" loading=\"lazy\" data-no-id=\"true\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/imagerecords\/154000\/154679\/iss071e609049.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;w=300 300w\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/imagerecords\/154000\/154679\/iss071e609049.jpg?fit=clip&#038;crop=faces%2Cfocalpoint&#038;%23038;w=300\" ><\/figure>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-inner\">\n            <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/a-halo-above-the-horizon-154679\/\" class=\"hds-content-item-heading\" rel=\"noopener\"><\/p>\n<div class=\"hds-a11y-heading-22\">A Halo Above the Horizon<\/div>\n<p>            <\/a><\/p>\n<div class=\"hds-content-item-readtime label margin-bottom-1\">\n                    3 min read                <\/div>\n<p class=\"margin-top-0 margin-bottom-1\">A subtle arc, formed by the bending of light through high-altitude ice crystals, cradles the Moon above the darkened Earth.<\/p>\n<div class=\"display-flex flex-align-center label color-carbon-60 margin-bottom-auto\"><svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg><span>Article<\/span><\/div>\n<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"pagination-container\" class=\"pagination\">\n<nav class=\"hds-pagination hds-pagination--content-lists\" role=\"navigation\" aria-label=\"Pagination Navigation\" data-mid-size=\"2\" data-end-size=\"1\" data-max-pages=\"4\" >\n<span aria-current=\"page\" class=\"page-numbers current\" aria-label=\"Current Page, Page 1\" aria-current=\"true\" data-page-number=\"1\"><br \/>\n<span>1<\/span><\/span><br \/>\n<a class=\"page-numbers\" href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/rings-of-rock-in-the-sahara\/#\" aria-label=\"Goto Page 2\" data-page-number=\"2\"><br 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object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/about\/NASA-EO-Logo-mediumBlue2016-stacked-mark.png?w=585&#038;h=425&#038;fit=crop&#038;crop=faces%2Cfocalpoint 585w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/about\/NASA-EO-Logo-mediumBlue2016-stacked-mark.png?w=300&#038;h=218&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/about\/NASA-EO-Logo-mediumBlue2016-stacked-mark.png?w=400&#038;h=291&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w\" sizes=\"auto, (max-width: 585px) 100vw, 585px\" \/><\/figure>\n<\/p>\n<\/div>\n<p>\t\t\t<\/a><br \/>\n\t\t\t\t\t<a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/image-of-the-day\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\" rel=\"noopener\"><\/p>\n<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n<div>\n<h3 class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Earth Observatory Image of the Day<\/span><br \/>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg><br \/>\n\t\t\t\t\t\t\t<\/h3>\n<p class=\"margin-bottom-0 margin-top-2 color-carbon-20-important\">NASA&#8217;s Earth Observatory brings you the Earth, every day, with in-depth stories and stunning imagery.<\/p>\n<\/p>\n<\/div>\n<\/div>\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"2500\" height=\"1407\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=2500&#038;h=1407&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=2500&#038;h=1407&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2500w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=300&#038;h=169&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=768&#038;h=432&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=1024&#038;h=576&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=1536&#038;h=864&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1536w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=2048&#038;h=1153&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2048w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=400&#038;h=225&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=600&#038;h=338&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=900&#038;h=507&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=1200&#038;h=675&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/iotd-banner.jpg?w=2000&#038;h=1126&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2000w\" sizes=\"auto, (max-width: 2500px) 100vw, 2500px\" \/><\/figure>\n<\/p>\n<\/div>\n<p>\t\t\t<\/a><br \/>\n\t\t\t\t\t<a href=\"https:\/\/science.nasa.gov\/earth\/explore\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\" rel=\"noopener\"><\/p>\n<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n<div>\n<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Explore Earth Science<\/span><br \/>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n<\/p>\n<\/div>\n<\/div>\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"1920\" height=\"1920\" src=\"https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1920&#038;h=1920&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1920&#038;h=1920&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1920w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=150&#038;h=150&#038;fit=crop&#038;crop=faces%2Cfocalpoint 150w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=300&#038;h=300&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=768&#038;h=768&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1024&#038;h=1024&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1536&#038;h=1536&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1536w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=50&#038;h=50&#038;fit=crop&#038;crop=faces%2Cfocalpoint 50w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=100&#038;h=100&#038;fit=crop&#038;crop=faces%2Cfocalpoint 100w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=200&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 200w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=400&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=600&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=900&#038;h=900&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1200&#038;h=1200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><\/figure>\n<\/p>\n<\/div>\n<p>\t\t\t<\/a><br \/>\n\t\t\t\t\t<a href=\"https:\/\/science.nasa.gov\/earth\/data\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\" rel=\"noopener\"><\/p>\n<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n<div>\n<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Earth Science Data<\/span><br \/>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n<\/p>\n<\/div>\n<\/div>\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"1536\" height=\"768\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?w=1536\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" 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desert.<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[16994,15821],"tags":[],"class_list":["post-326659","post","type-post","status-publish","format-standard","hentry","category-earth-observatory","category-expedition-73"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts\/326659","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=326659"}],"version-history":[{"count":2,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts\/326659\/revisions"}],"predecessor-version":[{"id":327339,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts\/326659\/revisions\/327339"}],"wp:attachment":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=326659"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=326659"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=326659"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}