Radar reveals a second potential impact crater under Greenlands ice

first_img Radar reveals a second potential impact crater under Greenland’s ice Click to view the privacy policy. Required fields are indicated by an asterisk (*) By Paul VoosenFeb. 12, 2019 , 5:30 PM Email Just months after revealing an impact crater the size of Washington, D.C., buried under the ice of northwestern Greenland, a team of scientists has discovered that it has company: a large depression 180 kilometers away that may also be an asteroid or comet impact crater.Several years ago, after researchers spotted the first crater hiding in plain sight under Greenland’s Hiawatha Glacier, they began to scour satellite records and ice-penetrating radar profiles for other circular deformations. Profiles from NASA’s IceBridge research flights revealed a 36-kilometer-wide, bowl-shaped depression surrounded by a rim, with a collection of raised peaks in the center resembling the uplift left after an asteroid or comet strikes Earth’s surface.But unlike the Hiawatha crater, the basin hasn’t yet yielded shocked quartz crystals, considered to be the best evidence of an extraterrestrial impact. The basin appears eroded and filled with ice older than Hiawatha’s crater, both of which suggest that, if it is a crater, it likely came from a different impact, the researchers write this week in Geophysical Research Letters. Country * Afghanistan Aland Islands Albania Algeria Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia, Plurinational State of Bonaire, Sint Eustatius and Saba Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory Brunei Darussalam Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo, the Democratic Republic of the Cook Islands Costa Rica Cote d’Ivoire Croatia Cuba Curaçao Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands (Malvinas) Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See (Vatican City State) Honduras Hungary Iceland India Indonesia Iran, Islamic Republic of Iraq Ireland Isle of Man Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea, Democratic People’s Republic of Korea, Republic of Kuwait Kyrgyzstan Lao People’s Democratic Republic Latvia Lebanon Lesotho Liberia Libyan Arab Jamahiriya Liechtenstein Lithuania Luxembourg Macao Macedonia, the former Yugoslav Republic of Madagascar Malawi Malaysia Maldives Mali Malta Martinique Mauritania Mauritius Mayotte Mexico Moldova, Republic of Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Norway Oman Pakistan Palestine Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Qatar Reunion Romania Russian Federation Rwanda Saint Barthélemy Saint Helena, Ascension and Tristan da Cunha Saint Kitts and Nevis Saint Lucia Saint Martin (French part) Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Sint Maarten (Dutch part) Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and the South Sandwich Islands South Sudan Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Swaziland Sweden Switzerland Syrian Arab Republic Taiwan Tajikistan Tanzania, United Republic of Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom United States Uruguay Uzbekistan Vanuatu Venezuela, Bolivarian Republic of Vietnam Virgin Islands, British Wallis and Futuna Western Sahara Yemen Zambia Zimbabwe Sign up for our daily newsletter Get more great content like this delivered right to you! Country NASA SCIENTIFIC VISUALIZATION STUDIO Although that may seem an implausible coincidence, other unrelated impact pairs have been found in Ukraine and Canada. And the rate of cosmic collisions needed to achieve such a coincidence is possible, given recent studies charting an uptick in Earth’s bombardment by extraterrestrial objects over the past 300 million years.last_img

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