{"id":629662,"date":"2024-03-08T13:33:13","date_gmt":"2024-03-08T18:33:13","guid":{"rendered":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg"},"modified":"2024-03-08T13:37:12","modified_gmt":"2024-03-08T18:37:12","slug":"pia23669orig","status":"inherit","type":"attachment","link":"https:\/\/www.nasa.gov\/image-detail\/pia23669orig\/","title":{"rendered":"Martian Barchan Dunes"},"author":334,"comment_status":"closed","ping_status":"closed","template":"","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"","nasa_hds_core_meta_linked_locations":[],"nasa_hds_core_meta_article_related_articles":[],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"nasa_hds_core_meta_video_cc_file_id":"","nasa_hds_core_meta_audio_cc_file_id":""},"media-tags":[],"read_time":1,"video_cc_url":"","audio_cc_url":"","credits":"NASA\/JPL-Caltech\/University of Arizona","original_date":{"stamp":1579132800,"display":"January 16th, 2020"},"description":{"rendered":"<p class=\"attachment\"><a href='https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"188\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=300\" class=\"attachment-medium size-medium\" alt=\"An aerial view of the reddish-brown surface of Mars taken by the Mars Reconnaissance Orbiter. Barchan dunes (circular dunes) appear here like oval divots in the ground. Linear dunes also appear.\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg 2880w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=300,188 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=768,480 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=1024,640 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=1536,960 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=2048,1280 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=400,250 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=600,375 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=900,563 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=1200,750 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?resize=2000,1250 2000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>This image shows two types of sand dunes on Mars. The small dots are called barchan dunes, and from their shape we can tell that they are upwind. The downwind dunes are long and linear. These two types of dune each show the wind direction in different ways: the barchans have a steep slope and crescent-shaped “horns” that point downwind, while the linear dunes are stretched out along the primary wind direction. Linear dunes, however, typically indicate a wind regime with at least two different prevailing winds, which stretch out the sand along their average direction. In several places in this image, you can find barchan dunes turning into linear dunes as they are stretched out, but they both seem into indicate the same wind direction.<\/p>\n"},"caption":{"rendered":"<p>This image shows two types of sand dunes on Mars. The small dots are called barchan dunes, and from their shape we can tell that they are upwind. The downwind dunes are long and linear. These two types of dune each show the wind direction in different ways: the barchans have a steep slope and crescent-shaped “horns” that point downwind, while the linear dunes are stretched out along the primary wind direction. Linear dunes, however, typically indicate a wind regime with at least two different prevailing winds, which stretch out the sand along their average direction. In several places in this image, you can find barchan dunes turning into linear dunes as they are stretched out, but they both seem into indicate the same wind direction.<\/p>\n"},"alt_text":"An aerial view of the reddish-brown surface of Mars taken by the Mars Reconnaissance Orbiter. Barchan dunes (circular dunes) appear here like oval divots in the ground. Linear dunes also appear.","media_type":"image","mime_type":"image\/jpeg","media_details":{"width":2880,"height":1800,"file":"2024\/03\/pia23669orig.jpg","filesize":944875,"sizes":{"thumbnail":{"file":"pia23669orig.jpg?resize=150,150","width":150,"height":150,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=150&h=150&crop=1"},"medium":{"file":"pia23669orig.jpg?resize=300,188","width":300,"height":188,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=300"},"medium_large":{"file":"pia23669orig.jpg?resize=768,480","width":768,"height":480,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=640"},"large":{"file":"pia23669orig.jpg?resize=1024,640","width":1024,"height":640,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=640"},"1536x1536":{"file":"pia23669orig.jpg?resize=1536,960","width":1536,"height":960,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=1536"},"2048x2048":{"file":"pia23669orig.jpg?resize=2048,1280","width":2048,"height":1280,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=2048"},"thumbnail-sm":{"file":"pia23669orig.jpg?resize=50,50","width":50,"height":50,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=50&h=50&crop=1"},"thumbnail-md":{"file":"pia23669orig.jpg?resize=100,100","width":100,"height":100,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=100&h=100&crop=1"},"thumbnail-lg":{"file":"pia23669orig.jpg?resize=200,200","width":200,"height":200,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=200&h=200&crop=1"},"card-xsm":{"file":"pia23669orig.jpg?resize=400,250","width":400,"height":250,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=400"},"card-sm":{"file":"pia23669orig.jpg?resize=600,375","width":600,"height":375,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=600"},"card-md":{"file":"pia23669orig.jpg?resize=900,563","width":900,"height":563,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=900"},"card-lg":{"file":"pia23669orig.jpg?resize=1200,750","width":1200,"height":750,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=1200"},"fullwidth":{"file":"pia23669orig.jpg?resize=2000,1250","width":2000,"height":1250,"filesize":944875,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg?w=2000"},"full":{"file":"pia23669orig.jpg","width":640,"height":400,"mime_type":"image\/jpeg","source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg"}},"image_meta":{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0","keywords":[]},"credits":"NASA\/JPL-Caltech\/University of Arizona","original_date":{"stamp":1579132800,"display":"January 16th, 2020"}},"post":null,"source_url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/03\/pia23669orig.jpg","_links":{"self":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media\/629662"}],"collection":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media"}],"about":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/types\/attachment"}],"author":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/users\/334"}],"wp:term":[{"taxonomy":"media-tags","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media-tags?post=629662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}