The proposed Hiawatha impact crater is estimated to be 19 miles wide, larger than Washington, D.C.
Sources
- City-size impact crater found under Greenland ice (nationalgeographic.com)
- https://www.science.org/content/article/massive-crater-under-greenland-s-ice-points-climate-altering-impact-time-humans (science.org)
- https://svs.gsfc.nasa.gov/12941 (svs.gsfc.nasa.gov)
- https://www.sci.news/othersciences/geoscience/hiawatha-impact-crater-greenland-06610.html (sci.news)
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