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Complete transcript available.

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Their finding is described in a study published on Nov. 14 in the journal Science Advances. \r\rThe crater is roughly a thousand feet deep and more than 19 miles in diameter, encompassing an area slightly larger than that comprised inside the Capital Beltway around Washington, D.C. Its dimensions place it among the 25 largest impact craters on Earth. The crater formed when an iron meteorite more than half a mile wide smashed into northwest Greenland – but the timing of when the event happened remains a key question and one the researchers want to answer next. The authors put the range between less than 3 million years ago and as recently as less than 13,000 years ago. The resulting depression has since been covered by ice.\r\rThis narrated video outlines the discovery and includes data visualizations which can be found here: https://svs.gsfc.nasa.gov/4572

Footage and co-production courtesy of the National History Museum of Denmark/University of Copenhagen, the Underground Channel, and the Alfred Wegener Institute.

Music credit: \"Timelapse Variations - Remixed.\" Natalie Draper, Composer. Original recording: Symphony Number One, SNOtone Records. Dan Rorke, Audio Engineer. Jordan Smith, Music Director.

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The surface of the ice sheet fades away to show the impact crater discovered beneath the ice sheet. A red cylinder shows the best-fit rim of the impact crater and a measuring stick shows that the diameter of the crater is more than 31 kilometers across. The size of the crater is compared to the cities of Washington, DC and Paris, France.The visualization also shows how the scientists from Germany's Alfred Wegener Institute (AWI) flew the Polar 6 aircraft (a DC-3T) to collect radar data over the Hiawatha impact crater. The radar data is shown in detail as curtains of the radar data are dissolved away to display the layers of the ice sheet in the interior of the crater. || Hiawatha.0590_print.jpg (1024x576) [150.4 KB] || Hiawatha.0590_searchweb.png (320x180) [88.4 KB] || Hiawatha.0590_thm.png (80x40) [6.2 KB] || 4706_Hiawatha_Crater.webmhd.webm (1080x606) [23.5 MB] || 4706_Hiawatha_Crater.mp4 (1920x1080) [228.6 MB] || 3840x2160_16x9_30p (3840x2160) [0 Item(s)] || 4706_Hiawatha_Crater.en_US.vtt [2.1 KB] || 4706_Hiawatha_Crater.en_US.srt [2.0 KB] || Hiawatha_Prores_4k.mp4 (3840x2160) [566.2 MB] || 4706_Hiawatha_Crater.mov (1920x1080) [1.9 GB] || Hiawatha_Prores_4k.mov (3840x2160) [7.6 GB] || ", "release_date": "2019-07-28T00:00:00-04:00", "update_date": "2025-02-02T00:11:51.633507-05:00", "main_image": { "id": 397193, "url": "https://svs.gsfc.nasa.gov/vis/a000000/a004700/a004706/Hiawatha.0590_print.jpg", "filename": "Hiawatha.0590_print.jpg", "media_type": "Image", "alt_text": "This visualization shows the location of the Hiawatha Glacier near Inglefield Land in northwest Greenland. The surface of the ice sheet fades away to show the impact crater discovered beneath the ice sheet. A red cylinder shows the best-fit rim of the impact crater and a measuring stick shows that the diameter of the crater is more than 31 kilometers across. The size of the crater is compared to the cities of Washington, DC and Paris, France.The visualization also shows how the scientists from Germany's Alfred Wegener Institute (AWI) flew the Polar 6 aircraft (a DC-3T) to collect radar data over the Hiawatha impact crater. The radar data is shown in detail as curtains of the radar data are dissolved away to display the layers of the ice sheet in the interior of the crater.", "width": 1024, "height": 576, "pixels": 589824 } }, { "id": 4572, "url": "https://svs.gsfc.nasa.gov/4572/", "page_type": "Visualization", "title": "The Hiawatha Impact Crater", "description": "The series of visualizations below are derived from satellite imagery and radar sounding. They portray both the location and size of the 31-kilometer-wide impact crater beneath Hiawatha Glacier. They also portray the structure of the glacier ice that flows into and fills the crater.The Hiawatha impact crater was first suspected to exist in the summer of 2015, from examination of a compilation of Greenland's sub-ice topography radar measurements made by NASA over two decades. The visualizations of the subsurface shown below are derived from a spring 2016 airborne survey by Germany's Alfred Wegener Institute, using a new ultrawideband radar sounder developed by the Center for Remote Sensing of Ice Sheets at The University of Kansas. Subsequent helicopter visits to the deglaciated terrain in front of Hiawatha Glacier by scientists from the Natural History Museum in Denmark recovered sediment samples from the main river that discharges water from beneath Hiawatha Glacier, through the northwestern rim breach. Laboratory examination revealed that these sediment samples contained shocked quartz and elevated platinum-group-element concentrations, both signs that the sediment records evidence of the impact of an iron asteroid more than one kilometer wide. The Hiawatha impact crater is potentially one of the youngest large impact craters on Earth.In the visualizations below, the elevation of the topography of the bed, the ice surface and the radar curtains have been exaggerated ten times in order to better illustrate their structure. || ", "release_date": "2018-11-14T14:00:00-05:00", "update_date": "2025-02-02T22:33:21.416878-05:00", "main_image": { "id": 413069, "url": "https://svs.gsfc.nasa.gov/vis/a000000/a004500/a004572/Hiawatha_v45_scene1_4k_5mtopo.1600_print.jpg", "filename": "Hiawatha_v45_scene1_4k_5mtopo.1600_print.jpg", "media_type": "Image", "alt_text": "Starting from a global view, this visualization zooms into Inglefield Land in northwest Greenland and shows the location of Hiawatha Glacier. The surface of the ice sheet is then faded away to show the impact crater beneath the ice sheet. A red cylinder shows the best-fit rim of the impact crater and a measuring stick shows the diameter as more than 31 kilometers across. The size of the crater is compared to the cities of Washington, DC and Paris, France.This video is also available on our YouTube channel.", "width": 1024, "height": 576, "pixels": 589824 } } ], "products": [], "newer_versions": [], "older_versions": [], "alternate_versions": [] }