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In the April 27 SN: The first image of a black hole, anxiety in preschoolers, an obscure sexually transmitted parasite, fossil finds spark a dinosaur debate, a quantum engine surges ahead and more. This topographic map strips away the ice to show the kilometer-wide crater. For three years, a team of scientists kept a big secret: They had discovered a giant crater-shaped depression buried beneath about a kilometer of ice in northwestern Greenland.
In November, the researchers revealed their find to the world. If the kilometer-wide depression is confirmed to be the remnant of a meteorite impact — and the team has produced a wealth of evidence suggesting that it is SN: Soot and other particles from the fires blocked out the sun, causing the cold snap, which has been blamed for everything from the extinction of the mammoths to the disappearance of a group of people known as the Clovis. Most scientists reject that an impact was responsible, refuting the idea that there were vast wildfires at the time or that the Clovis people even disappeared.
Another big objection: But a large, recent impact would be extremely unlikely, given the rarity of such impacts on Earth, particularly on land, says planetary scientist Clark Chapman of the Southwest Research Institute in Boulder, Colo. Indeed, one sticking point is that there are no direct dates for the newly discovered crater, because it is still buried beneath all that ice. The radar data offer only tantalizing clues to the age, suggesting that the crater is between 2.
Instead of a fragment of a comet, the discoverers think the Hiawatha impactor was an iron meteorite. That determination is based on measurements of platinum and other elements in glacial outwash, sediments carried by meltwater from beneath the ice. An iron meteorite impact would probably not produce the kinds of explosive airbursts that could ignite continent-scale wildfires, says Michail Petaev, a geochemist at Harvard University.
Petaev and colleagues previously found a hint that an iron meteorite might have smacked into Greenland about 13, years ago. In , his group examined Greenland ice cores and found a strange platinum anomaly dating to right before the Younger Dryas. The ratio of platinum to iridium measured in the ice cores points to an iron meteorite, the team reported.
Despite the platinum data, the impact hypothesis proponents hold firmly to the idea that the Hiawatha impactor was a comet. Because little is known about comet compositions, Kennett says, a comet might well have been the source for the platinum found in the glacial outwash and the ice cores. Instead, he says, those ratios require the cycles of melting and recrystallizing that form iron meteorites, the ancient cores of asteroids or planets.
Asked whether the team has actually identified any other round shapes of interest, he pauses. A large impact crater beneath Hiawatha Glacier in northwest Greenland. Science Advances. Published online November 14, Petaev et al. Large Pt anomaly in the Greenland ice core points to a cataclysm at the onset of Younger Dryas. Proceedings of the National Academy of Sciences. Science News. Signs of giant comet impact found in cores. Science News Online, March 30, Ice Age ends smashingly: Did a comet blow up over eastern Canada?
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A huge impact crater has been discovered under a half-mile-thick Greenland ice sheet. The enormous bowl-shaped dent appears to be the result of a mile-wide iron meteorite slamming into the island at a speed of 12 miles per second as recently as 12, years ago.
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E-mail address: Use the link below to share a full-text version of this article with your friends and colleagues. Learn more. A precise age scale based on annual layer counting is essential for investigating past environmental changes from ice core records. Based on the age scale, the average accumulation rate from to is reconstructed as 1.
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The U. May Ban Kratom. But Are its Effects Deadly or Lifesaving? Black triangles and purple circles are elevated peaks around the rim and center. Dotted red lines and black circles show locations of additional sampling. And along the way, scientists have turned up a plethora of craters big and small. But there was always one major crater missing. Temperatures slowly rose while glaciers retreated, that is, until something major happened that triggered a cold snap big enough to leave its mark on the geologic record. Over the course of just decades — the blink of an eye in geological timescales — the planet cooled somewhere between 3 and 11 degrees Fahrenheit 2 to 6 degrees Celsius. The resulting period is known as the Younger Dryas, a mysterious year blip in history. Many scientists have suggested — with evidence — that the Younger Dryas was triggered by a meteorite impact. But others have held out, suggesting that volcanic eruptions or, what seems to be the leading favorite, some sort of massive freshwater flood temporarily disrupted climate cycles based out of the North Atlantic.
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Greenland crater renewed the debate over an ancient climate mystery
An unusually large asteroid crater measuring 19 miles wide has been discovered under a continental ice sheet in Greenland. An iron-rich asteroid measuring nearly a kilometer wide 0. Over time, however, the gaping hole was obscured by a 1,meter-tall 3,foot layer of ice, where it remained hidden for thousands of years. Larsen, a co-author of the study and a geoscientist at Aarhus University, told Gizmodo. Larsen, along with his colleague Kurt Kjaer from the Natural History Museum of Denmark, immediately recognized that they had stumbled upon something special, but it soon became apparent that the depression would be hard to confirm as a remnant of an ancient asteroid strike. The first step was to analyze aerial surveys taken of Greenland from to by researchers from the University of Kansas. This was accomplished in using wideband ground-penetrating radar or in this case, ice-penetrating radar developed at the University of Kansas.
All rights reserved. No one knew for sure, but some of the villagers suspected the dogs had heard the exhalations of narwhals. The whales with the spiral unicorn tusks usually swim into Uummannaq Fjord this time of year as they migrate south. That afternoon, beneath a lowering gray sky, the hunters return, dragging their boats ashore. Among them is Ilannguaq Egede, the year-old manager of the village power plant. He came here nine years ago from south Greenland, where sheep farmers far outnumber whalers, to be with a Niaqornat woman he met on an Internet dating site.
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